Explanation:
N2 (g) + H2 (g) gives out NH3 (g)
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.(If you balance the hydrogen reactant with a whole number first, I can guarantee you that you will have to give NH3 a new stoichiometric coefficient.)
N2 (g) + 3H2 (g) gives out 2NH3 (g)
The stoichiometric coefficients tell you that if we can somehow treat every component in the reaction as the same (like on a per-mol basis, hinthint), then one "[molar] equivalent" of nitrogen yields two [molar] equivalents of ammonia.
Luckily, one mol of anything is equal in quantity to one mol of anything else because the comparison is made in the units of mols.
So what do we do? Convert to
mols (remember the hint?).
28g N2 × 1 mol N2/ 2 × 14.007) g N2
= 0.9995 mol N2
At this point you don't even need to calculate the number of mols of H2 . Why? Because H2 is about 2 g/mol, which means we have over 10 mols of H2. We have 1 mol N2, and we need three times as many mols of H2 as we have
N2.
After doing the actual calculation you should realize that we have about 4 times as much H2 as we need. Therefore the limiting reagent is clearly N2.
Thus, we should yield 2×0.9995=1.9990 mols of NH3 (refer back to the reaction). So this is the second and last calculation we need to do:
1.9990 mol NH3 × 17.0307 g NH3/ 1 mol NH3
= 34.0444 g NH3
Hope it helpz~
34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
What is Mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of N₂ = 28g
Mass of H₂ = 25g
Moles of N₂ = mass / molar mass
= 28 / 28
= 1 mole
Moles of H₂ = 25 / 2
= 12.5 moles
Since the number of moles of N₂ is lesser, the amount of products formed depends on the moles of N₂.
From the reaction,
1 mole of N₂ gives 2 moles of NH₃
So, Mass of NH₃ in 2 moles = 2 × 17
= 34g
B) From the reaction,
1 mole of N₂ reacts with 3 moles of H₂.
The number of Moles of H₂ left = 12.5 - 3
= 9.5 moles
Mass of excess reagent left = moles left × molar mass of H₂
= 9.5 × 2
= 19g
Therefore, 34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
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2AI(NO3)3 + 3Na2CO3 → Al2(CO3)3(s) + 6NaNO3
What is the ratio of moles of AI(NO3)3 to moles Na2CO3?
The ratio of moles of AI(NO3)3 to moles Na2CO3 in the reaction is 2:3
In the reaction 2 moles of AI(NO3)3 reacted with 3 moles Na2CO3 so the ratio of the moles is 2 is to 3 represented as 2:3
hope it helps
When a 21.2 mL sample of a 0.411 M aqueous hydrofluoric acid solution is titrated with a 0.371 M aqueous barium hydroxide solution, what is the pH after 17.6 mL of barium hydroxide have been added
For a 21.2 mL sample of a 0.411 M aqueous hydrofluoric acid solution, the pH after 17.6 mL of barium hydroxide has been added is mathematically given as
pH=3.332
What is the pH after 17.6 mL of barium hydroxide has been added?Generally, the equation for the mole of HF is mathematically given as
mole of HF=molarity*volume
Therefore
mole of HF=0.361*19.2
mole of HF=6.931mmol
The chemical equation
HF+kOH⇆KF+H2O
Therefore
pH=pKa+log(Kf/HF)
pH=3.15+log(6.931*53.6/53.6*4.558)
pH=3.332
In conclusion, The pH
pH=3.332
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How many moles of gas are present in the sample of gas occupies that 4.32 L at 1.45 atm pressure and -18oC? (Include your formula used and the set-up.)
The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]
Given the data in the question;
Volume; [tex]V = 4.32L[/tex]
Pressure; [tex]P = 1.45atm[/tex]
Temperature; [tex]T = -18^oC = 255.15K[/tex]
Amount of gas; [tex]n =\ ?[/tex]
To determine the moles of gas, we substitute our given values into the expression above.
[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]
Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
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A sample of methane gas contains 3.62x10^29 atoms of hydrogen. What is the mass of the sample?
The mass of the sample to methane that contains 3.62×10²⁹ atoms of hydrogen is 4810631.24 g
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of Hydrogen
How to determine the mass of Hydrogen1 mole of Hydrogen = 2 g
Thus,
6.02×10²³ atoms = 2 g of Hydrogen
Therefore,
3.62×10²⁹ atoms = (3.62×10²⁹ × 2) / 6.02×10²³
3.62×10²⁹ atoms = 1202657.81 g of Hydrogen
How to determine the mass of methane 1 mole of methane, CH₄ = 12 + (4×1) = 16 gMass of H in 16 g of CH₄ = 4 × 1 = 4 gThus,
4 g of Hydrogen is present in 16 g of methane.
Therefore,
1202657.81 g of Hydrogen will be present in = (1202657.81 × 16) / 4 = 4810631.24 g of methane
Thus, we can conclude that the mass of the sample of methane is 4810631.24 g
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There are 7 named classes of hazardous materials.
O True
O False
False, there are 9 named classes of hazardous materials.
What are hazardous materials?Hazardous materials are substances or chemicals that pose a health hazard, a physical hazard, or harm to the environment.
There are 9 hazardous substances symbols you need to know: flammable, oxidising, explosives, gas under pressure, toxic, serious health hazard, health hazard, corrosive and environmental hazard.
Hence, the statement is false.
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At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr.
What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of 383 torr at 25°C?
ANSWER IS 6.45×10-1
QUESTION: What is the mole fraction of hexane in the vapour that is in equilibrium with this solution?
(Assume ideal gas behaviour.)
Based on the vapor pressure of the pure substances, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
What is vapor pressure of a liquid?Vapor pressure of of a liquid is the pressure that is excreted on the walls of a sealed vessel by the molecules of the liquid that have been converted to gaseous phase.
TO determine the mole fraction of pentane in the solution, we use the vapor pressure of the pure substances.
Let the mole fraction of pentane in the mixture be X.
The mole fraction of hexane will be 1 - X
The vapor pressure of the solution = (mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane)Vapor pressure of solution = 383 torr
(mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane) = 383 torr
X × 511 + (1 - X) × 150 = 383
511X - 150X + 150 = 383
511X = 233
X = 0.45
Also , at equilibrium, the vapor pressure of pentane = 0.45 × 511 = 230 torr
mole fraction of hexane in the vapor that is in equilibrium with this solution = 230/383
mole fraction of hexane at equilibrium = 0.60
Therefore, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
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How many grams of aluminum will be deposited by 0.1F? (Al=27) a.0.3g b. 0.9. c. 9.0g. d. 2.7g
Based on the charge on the aluminium ion, 0.9 g of aluminium are deposited by 0.1 F of electricity.
What is electrolysis?Electrolysis is the decomposition of a substance known as an electrolyte when electric current is passed through it.
The mass and hence moles an electrolyte deposited when current is passed through it depends on the charge on the ion.
Aluminium ion has a charge of +3 and requires 3F of electricity to deposit 1 mole or 27 g of aluminium
0.1 F will discharge = 0.1/3 × 27 g of aluminium
mass of aluminium deposited = 0.9 g of aluminium.
Therefore, 0.9 g of aluminium are deposited by 0.1 F of electricity.
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Write an equation that represents the action in water of hypoiodous acid ( HOI ) as a Brønsted–Lowry acid.
Taking into account the Brønsted-Lowry acid-base theory, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
Brønsted-Lowry acid-base theoryThe Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors. That is, an acid is a species that donates an H⁺ proton while a base is a chemical species that accepts an H⁺ proton from the acid.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
Reaction between hypoiodous acid and waterIn this case, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
where HOI acts as an acid because it donates a potron, while water acts as a base because it accepts the proton donated by HOI.
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2C6H6 + 1502 →12CO2 + 6H20
Calculate the number of moles of C6H6 needed to produce 50.0g of water.
Show steps
Answer:
.926 moles
Explanation:
Rounding :
H2 0 = 18 gm/mole
50 gm would then be 50 / 18 = 2.7777 moles of water
every two moles of 2 C6H6 produces 6 moles of water
2.7777/6 * 2 = .926 moles
PROBLEM SETS: %BY MASS, % BY VOLUME, MOLARITY, MOLALITY (show your solution)
1. What is the molarity of a solution in which 0.850 grams of ammonium nitrate are dissolved in 345 mL of solution?
2. Calculate the molality of a solution of 13.5g of KF dissolved in 250. g of water.
3. Calculate the molality of a solution containing 16.5 g of dissolved naphthalene (C10H8) in 54.3 g benzene (C6H6).
4. What is the mass percent of each component in the mixture formed by adding 12 g of calcium sulfate, 18 g of sodium nitrate, and 25 g of potassium chloride to 500 g of water?
5. A solution is made by dissolving 125 g of sodium chloride in 1.5 kg of water. What is the percent by mass?
6. What is the percent by volume of a solution formed by added 15 L of acetone to 28 L of water?
The concentration of a substance can be expressed using molarity, molality or percent.
What is concentration?The term concentration has to do with the amount of substance present in solution. Now let us solve the problems individually;
a) Number of moles = 0.850 grams/80 g/mol = 0.011 moles
molarity = 0.011 moles/345 * 10^-3 L = 0.032 M
b) Number of moles = 13.5g /58 g/mol = 0.23 moles
molality = 0.23 moles/250 * 10^-3 Kg = 0.92 m
c) Number of moles = 16.5 g/128 g/mol = 0.13 moles
molality = 0.13 moles/54.3 * 10^-3 Kg =2.39 m
d) Total mass present = 12 g + 18 g + 25 g + 500 g = 555 g
mass percent of calcium sulfate = 12 g/555 g * 100/1 = 2.2 %
mass percent of sodium nitrate = 18 g/ 555 g * 100/1 = 3.2 %
mass percent of potassium chloride = 25 g / 555 g * 100/1 = 4.5%
mass percent of water = 500 g / 555 g * 100/1 =90.1%
e) Total mass present = 125 g + 1500g = 1625 g
Mass percent of NaCl = 125 g/1625 g * 100/1 = 7.7%
f) Total volume of solution = 15 L + 28 L = 43 L
percent by volume of acetone = 15 L/43 L * 100/1 = 34.9%
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you find a mysterious white powder in your kitchen. it could be cream of tartar (pH=5), sugar (pH=7), baking soda (pH=8), or drain cleaner (pH=14). explain which pH indicator(s) you would use to determine the unknown substance.
The pH indicators that would be used to determine the unknown substance are :
Litmus Methyl orangePhenol RedpH IndicatorsThe pH indicators that can be used to identify the mysterious white powder in the kitchen must be an acid-base indicator such as Litmus or other form of effective pH indicators like methyl orange and Phenol red.
The pH value of the substance as indicated by the acid-base indicators will help to determine what the mysterious white powder is based on the varying pH of the substances resembling the white powder.
Hence we can conclude that The pH indicators that would be used to determine the unknown substance are :Litmus , Methyl orange, Phenol Red.
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what does rows represent on the periodic table
Answer:
Rows on the periodic table represents a period, which is the number of energy levels or rings. It is the last shell which valence electrons are on.
For example the first row waas Hydrogen and Helium which each have one energy level.
The esecond row has Carbon and Oxygen which has two energy level.
The third row has Sodium which has three energy levels and so on.
pls help me with this
Answer:
silver
5/20
=0.25.................
Answer:
C
Explanation:
Aluminum density = 0.5
Iron density = 2
Gold density = 1
Silver density = 0.25
The smallest value is 0.25 hence silver has less density.
Decomposition of hydrogen peroxide: 2H2O2 --> O2(g) + 2H2O(l) How many molecules of water are produced from the decomposition of 3.4g of hydrogen peroxide, H2O2?
Answer:
Explanation:
You have the equation. Now change the 3.4 g H2 to moles. moles = grams/molar mass
3.4 g/2.016 = 1.686 moles.
Now using the coefficients in the balanced equation, convert moles H2O2 to moles H2O.
1.686 moles H2 x (2 moles H2O/2 moles H2O2) = 1.686 x (2/2) = 1.686 x (1/1) = 1.686 moles H2O.
Now you know that 1 mole of water is composed of 6.022 x 10^23 molecules. So
1.686 moles H2O x (6.022 x 10^23 molecules H2O/1 mole H2O) = ?? molecules.
When .080 moles of propane burn at STP, what volume of carbon dioxide is produced?
The answer is 5.4 L (I NEED THE STEPS)
The volume of carbon dioxide produced is : 5.4 L
Given data:
moles of propane = 0.080 moles
Determine the volume of Carbon dioxide producedThe chemical reaction
C₃H₈ + 5O₂ ---- > 3CO₂ + 4H₂O
From the reaction
I mole of C₃H₈ = 3CO₂
0.080 moles of C₃H₈ = 3 * 0.080 = 0.24
Applying the equation below to determine the volume of CO₂
Pv = nRT
= 0.24 * R * T
v = ( 0.24 * 8.314 * 273 ) / 1 atm
= 544.7 ml = 5.4 L
Hence we can conclude that The volume of carbon dioxide produced is : 5.4 L
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The correct IUPAC name for 2-isopropylbutane is: a) 2-ethylpentane b) 2,3-dimethylpentane c) 2-methylhexane d) 3-methylhexane
Answer:
a
Explanation:
On drawing the structure, the most Carbon atoms in a row is 5
⇒ pentaneThe remaining two carbon atoms are connected to the 2nd carbon atom
2-ethylIUPAC name is :
2-ethyl + pentane2-ethylpentaneWhich of the following is not an example of a modified silicate?
Ceramics
Glass
Cement
Quartz
Quartz is not regarded as an example of a modified silicate.
What is Quartz?This is defined as a hard, crystalline mineral composed of silica with a tetrahedral shape. Silica is also referred to as Silicon dioxide(SiO₂).
This type of mineral is a naturally occurring crystal and isn't a modified silicate but the rest can be modified using their respective constituents thereby making option D the most appropriate choice.
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Thermal energy always moves from a greater energy level to a lesser energy level
Theory or law?
Give an explanation please
Answer:
[tex]\fbox{Law -Based \: on \: laws \: of \: thermodynamic}[/tex]
Explanation:
At constant pressure Thermal energy always moves from a greater energy level to a lesser energy level, laws of thermodynamics prove that.
Nature always likes to attain equilibrium either it's movement of heat energy or flow of water from higher region to lower region. The first and second law of thermodynamics are profe of that, the first law says that the total energy of universe is Constant. Energy can not be destroyed it always changes from one form to another, by work and heat. The second law explains why thermal energy moves from a greater energy level to a lesser energy level, it deals with the change in entropy of a system and surrounding and states heat flows from hot environment to cold environment.
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2. Which substance has definite volume and weight, but not a definite
shape?
B
A. ice
wood
C. gasoline
D. steam
Answer:
A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape. The change from solid to liquid usually does not significantly change the volume of a substance
Explanation:
no explanation
Becquerel placed photographic paper in a drawer with some radioactive rocks and discovered that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks. True False
Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks
What is radioactivity?The phenomenon of radioactivity was discovered by the French scientist Henri Becquerel in 1896 when he placed photographic paper in a drawer with some radioactive rocks.
We have to note that Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks hence the stetement is false.
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- If you have bottle filled with Sulfur Hexafluoride and there are 1.00 L of the liquid with a density of 1.60 g/mL, how many moles of the liquid are present?
Answer:
About 11.0 moles.
Explanation:
We are given a bottle filled with 1.00 L of sulfur hexafluoride (SF₆) and we want to determine the number of moles of the liquid that is present.
First, determine its mass with the given density:
[tex]\displaystyle \begin{aligned}\rho & = \frac{m}{V} \\ \\ m & = \rho V \\ \\ & = \left(\frac{1.60\text{ g}}{\text{mL}}\right)(1.00\text{ L})\left(\frac{1000\text{ mL}}{1\text{ L}}\right) \\ \\ & = 1.60\times 10^3 \text{ g}\end{aligned}[/tex]
The molecular weight of SF₆ is 146.07 g/mol. Hence:
[tex]\displaystyle 1.60\times 10^3\text{ g SF$_6$} \cdot \frac{1\text{ mol SF$_6$}}{146.07\text{ g SF$_6$}} = 11.0\text{ mol SF$_6$}[/tex]
Therefore, about 11.0 moles of sulfur hexafluoride is present.
I need help it’s calculating ph
When .080 moles of propane burn at STP, what volume of carbon dioxide is produced?
The answer is 5.4 L (I NEED THE STEPS)
Taking into account the reaction stoichiometry and the definition of STP, 5.4 L of carbon dioxide is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 5 moles CO₂: 3 moles H₂O: 4 molesMoles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 1 mole of C₃H₈ form 3 moles of CO₂, 0.080 moles of C₃H₈ form how many moles of CO₂?
[tex]amount of moles of CO_{2} =\frac{0.080 moles of C_{3} H_{8}x3 moles of CO_{2} }{1 mole of C_{3} H_{8} }[/tex]
amount of moles of CO₂= 0.24 moles
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of CO₂ producedYou can apply the following rule of three: If by definition of STP 1 mole of CO₂ occupies 22.4 L, 0.24 moles of CO₂ how much volume does it occupy?
[tex]volume of CO_{2} =\frac{0.24 molesx22.4 L}{1 mole}[/tex]
volume of CO₂= 5.376 L ≅ 5.4 L
Finally, 5.4 L of carbon dioxide is produced.
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If you were to classify a newly discovered animal, what would you want to know first?
Does it live on land or in the sea?
Does it have a backbone?
Does it have hair?
Does it have vascular tissue?
Answer:
A
Does it live on land or sea.
Answer:
C:
I would check that does it have hair or not because hair provides info about the DNA which can help me if that specific animal has evolved from DNA of any other animal..
Hope it helped you.
What are two relatively unique physical properties of water? What impact do these properties have on life on Earth?
Answer:
Polar molecule. A neutral, or uncharged molecule that has an asymmetric internal distribution of charge, leading to partially positive and partially negative regions
Cohesion The attraction of molecules for other molecules of the same kind
Adhesion The attraction of molecules for other molecules of a different kind
Density The mass per unit volume of a substance
Specific heat capacity The amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius
Heat of vaporization The amount of energy needed to change one gram of a liquid substance to a gas at constant temperature
Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
What are Physical properties ?Cohesion molecules' attraction to other molecules of the same sort. Adhesion the pull of certain molecules toward others of a different type
Density a substance's mass per unit volume particular heat capacity The amount of heat required to increase a substance's temperature by one degree Celsius in one gram
Vaporization-related heat energy required to convert one gram of a liquid material into a gas at a fixed temperature.
Therefore, Polar substance. a molecule that is neutral or uncharged but has an asymmetric internal charge distribution that produces both positive and negative regions.
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what is the empirical formula of a cpd containing 60.0%of sulfur 40.0% oxygen by mass
Answer:
n S = 60 32 = 1.875 , n_S=\tfrac{60}{32}=1.875, nS=3260=1.875, n O = 40 16 = 2.5.
Explanation:
If a watershed suddenly receives a great deal of rainfall, what will happen to its wetlands and rivers?
Answer:
Depending on the actual amount of water, it's going to overfill.
Explanation:
If your watershed is already one that has a lot of water and is always filled, it's likely that your wetlands and rivers will start to overfill, causing a form of flooding.
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I hope this helps!
-No one
What mass of water is in a calorimeter where 225.0 J of heat are
transferred to the water from a heated piece of metal and the
temperature of the water is increased by 4.00°C?
Answer:
22.25 °C
Explanation:
Determine the final temperature when a 25.0 g piece of iron at 85.0 °C is placed into 75.0 grams of water at 20.0 °C.
what mass of water must be added to 0.50 mol of glucose to make a solution of 25 percent by mass? the molar mass of glucose is 180 g/mol. SHOW WORK PLSS.
Answer:
270 g of water
Explanation:
can u help me with this
Answer:
c
Explanation:
the reason is because your a homosiejenenddj