How many atoms of oxygen are in the reactants of the following equation? 3NO2 + H2O --> NO + 2HNO3

Answer: 4

Explanation:

The molality of the dimethyl ether in the solution is 15.8m

What is molarity ?

Molality (m), or molal concentration, is the amount of a substance dissolved in a certain mass of solvent. It is defined as the moles of a solute per kilograms of a solvent.

Moles of dimethyl ether= 80.1/46.07 = 1.74 moles

Molarity = moles of solute/ mass of solvent * 1000

                1.74/110*1000 = 15.8m

The molality of the dimethyl ether in the solution is 15.8m

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Answer:

False. F-F would be a covalent apolar molecule.

Explanation:

As we have two elements bonded of the same element, in this case, F (fluorine), they would be sharing electrons, making that the bonding is covalent but there are no charges, because they're the same element, so it would be a completely covalent apolar molecule.

Answer: For example, Christmas lights transform electrical energy into thermal energy and light energy.

Explanation: so it either thermal or light, most likely light.

Answer:

D) Nondisjunction

Explanation:

Nondisjunction happens when a chromosome pair doesn't separate during meiosis. A result is one of the gamates has to any chromosome, while others have much less.

The temperature should be between 30 °F and 60 °F because the temperature outside is 39 °F, so the water in the pond should have a temperature range that includes this temperature.

Therefore, the answer is B.

1)Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.

2)In a nuclear fusion reaction, two small, light 'nuclei' (hydrogen atoms) combine under extreme 'temperature' and pressure to form one larger, heavier nucleus (helium).

The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in such a fusion reaction. So because mass of the emerging single nucleus is smaller than that of the combined mass of the two initial nuclei, the process generates electricity. Remaining mass is converted to energy.

Normal electrostatic forces between positively charged nuclei prohibit them from coming close enough to smash and allow fusion to occur, hence fusion is not feasible.

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1) Write the proper formula for Mg2+ and Br-

Balance the charges.

Mg2+: Multiply by 1. This gives a total of two positive charges.

Br-: Multiply by 2. This gives a total of two negative charges.

Use multipliers as subscripts

2) Write the proper formula for Al3+ and O2-

Al3+: Multiply by 2. This gives a total of six positive charges.

O2-: Multiply by 3. This gives a total of six negative charges.

Use multipliers as subscripts

ANSWER

STEP-BY-STEP EXPLANATION

17.05 L of O₂ are needed to react with 6.82 L of acetylene gas C₂H₂ at STP.

The reaction to the given question is :

2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O

From the equation we see

2 moles of C₂H₂ react with 5 moles of O₂

According to the equation,

        2 liters of Acetylene reacts with  =  5 liters of O₂

So,

             6.82 L Acetylene will produce  =  X L of O₂

Solving for X,

                         X  =  ( 6.82 L × 5 L ) ÷ 2 L

                         X  =  17.05 L of O₂

Thus, 17.05 L of O₂ is needed to react with 6.82 L of acetylene gas C₂H₂.

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When copper carbonate disolves the following happens:

The formula for the solubility product constant is:

As for every copper ion in solution there is one carbonate ion, we know that the concentration of both ions in solution is 0.57mol/l.

Now we calculate the constant:

So the answer is Ksp= 0.3249 mol2/L2

The final pressure when the sample of gas is administered to the new volume and temperature is 0.64 atm.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To determine the final pressure of the gas, plug the given values into the formula above and solve for P₂.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

P₂ = P₁V₁T₂ / V₂T₁

P₂ = ( 1.20 atm × 6.02L × 293.35K ) / ( 10.0L × 332.65K )

P₂ = ( 2119.1604 KLatm ) / ( 3326.5 KL )

P₂ = 0.64 atm

Therefore, the final pressure of the gas is 0.64 atm.

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Sulphur has a larger atomic radius than chlorine, even though chlorine has more protons, neutrons and electrons because sulfur is to the left of chlorine in the periodic table.

Atomic radius is defined as the distance between the atomic nucleus of an atom to the electron which is located at the outermost shell of the atom.

In the periodic table, the elements are being arranged in groups and periods with respect to their various atomic mass and numbers.

The atomic radius decreases across the period but increases down the group of the periodic table.

Therefore, sulphur would probably have a larger atomic radius when compared with chloride because it is located to the left of chloride in the periodic table.

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Answer:

what is this free

branliest?

Combination (also called synthesis): Where two elements or one compound and one element will bond and form a new compound as a product, the representation for this reaction is:

A + B -> AB

The only option that follows this description of Combination reaction is the first reaction:

N2 + O2 -> 2 NO

Answer: 2607.31 pa

Explanation:

n = 10.1/2 = 5.05 mol

Now, according to ideal gas equation,

PV = nRT

⇒ P × 5 = 5.05 × 8.314 × (37.5 +273)

⇒P = 2607.31 Pa

Here, there are 2 conditions of the gas here.

The next equation is used: (1)

Data: conditions 1

P1 = pressure, in mmHg = 571.6 mmHg

T1 = temperature, in K = 25 °C + 273 = 298 K

V1 = 2,275 mL

-------------

Data: conditions 2

P2 = needs to be calculated

T2 = 175 °C + 273 = 448 K

V2 = 1,255 mL

--------------

From (1), P2 is cleared:

(P1 x V1/T1) x T2/V2 = P2

(571.6 mmHg x 2,275 mL/298 K) x (448 K/1,255 mL) = P2

1558 mmHg = P2

Answer: P2 = 1558 mmHg

Answer

V2 = 1466.7 mL

Explanation

Given:

Volume 1 = 200 mL

Pressure 1 = 330.0 kPa

Pressure 2 = 45.0 kPa

Required: Volume 2

Solution:

To solve this problem we will use Boyles law

P1V1 = P2V2

V2 = P1V1/P2

V2 = (330.0 kPa x 200 mL)/45.0 kPa

V2 = 1466.7 mL

Common use for a type of electromagnetic radiation is Thermal imaging uses infrared waves.

When magnetic field comes in contact with electric field than electromagnetic radiations are formed. The magnetic field and the electric field are perpendicular to each other. types of electromagnetic waves are : Radio waves, Microwaves, Infrared waves, Visible light , Ultraviolet waves, X- rays , gamma rays.

A tanning bed uses the  ultraviolet waves

water purification uses the UV waves

Thermal imaging uses the infrared waves

weather radar use the Radio waves

Thus, Common use for a type of electromagnetic radiation is the Thermal imaging uses infrared waves.

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Answer: the second one

Explanation:

Answer:

there's no answer choices?

A coefficient of 2 has been put in front of Na₃PO₄, so to balance Na coefficient in front of NaCl will be 6.

The balanced equation of the reaction is -

2 Na₃PO₄ + 3 MgCl₂ → Mg₃(PO₄)₂ + 6 NaCl

This is a complete balance chemical equation of the given reaction with coefficient 6 in front of NaCl to balance Na.

Here,

We've been given a chemical equation which is unbalanced. A coefficient of 2 has been put in front of Na₃PO₄ and we are asked about what coefficient should go in front of NaCl so that the sodium Na is balanced. Since, there were total 3 Na before the coefficient was placed, but after putting the coefficient of 2, Na is 2 x 3, which is 6.

Therefore, an integer 6 is to be put in front of NaCl to balance Na in the equation.

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The heat absorbed or released by a substance is given by the following formula:

Where Q is the heat absorbed or released, m is the mass of the substance, Cp is the specific heat, T2 is the final temperature and T1 is the initial one.

We know the values of Q, m, T2 and T1 because they are given by the question statement, and we have to find the value of Cp.

Solve the equation for Cp and use the given values to find its value:

The specific heat of the substance is 0.49J/g°C.

The quantum numbers for the next electron added to this atom are  n = 2, ℓ = 0, mℓ = 0, ms = -½

The set of numbers used to explain the placement and strength of the electron in an atom are called quantum numbers. There are 4 quantum numbers, particularly, main, azimuthal, magnetic, and spin quantum numbers. The values of the conserved portions of a quantum gadget are given by quantum numbers.

The price of n tiers from 1 to the shell of the outermost electron of that atom. The important quantum variety may be determined by way of searching the period (numbered row) of the element on the periodic table. The principal quantum numbers of electrons inside the S-block and P-block are similar to the period range.

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According to the concept of molar concentration,0.715 g of hydrogen iodide are dissolved in the solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Using the formula of M₁V₁=M₂V₂ molarity of HI is determined,that is ,M₂=0.25×22.4/15=0.373 M.

For determining the mass is determined by using the formula,mass=0.373×127.911×0.015=0.715 g

Thus, 0.715 g of hydrogen iodide are required for making the solution.

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The effect of acid you think is most important because chemical that can donate a hydrogen ion to other molecule

Acid is an that in water solution taste sour and changes blue litmus to red and react to some metal to liberate hydrogen react with bases to form salt and and also promote chemical reaction and the effect of acid is the chemical that can donate hydrogen ion to other molecule and the result in other molecule changing shape and possibly breaking apart

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Answer:

Explanation:

C

Answer:

I think the answer to your question is option A.

The question requires us to calculate the mass of reactant (O2) necessary to obtain 15 L of the product (NO2) under the conditions given.

The following information was provided by the question:

- Balanced chemical reaction: 2 NO(g) + O2(g) → 2 NO2(g)

- Final volume of NO2: 15 L

- Pressure: P = 752 mmHg

- Temperature: 344 K

- Gas constant: R = 0.08206 L⋅atm/mol⋅K

To solve this question, we'll need to go through the following steps:

1) calculate the number of moles that corresponds to 15 L of NO2, considering the temperature and pressure given;

2) use the stoichiometric relation to calculate the necessary amount of O2 to produce the previously calculated number of moles of NO2

3) use the molar mass of O2 and the value calculated on step 2 to obtain the necessary mass of O2

Next, we'll solve the problem following these steps:

1) To calculate the number of moles of NO2, we'll use the following equation:

where P is the pressure, V is the volume of gas, n is the number of moles, R is the constant of gases and T is the temperature.

If we rearrange the equation to calculate the number of moles, we'll have:

Note that the problem provided all necessary information for this calculation, but the pressure given (752 mmHg) needs to be converted into atm to match the constant provided.

To do that, we'll use the following:

1 atm = 760 mmHg

Thus, we need to divide the value provided by 760:

Now, we can apply the values of pressure, volume and temperature, as well as the constant provided, to the equation written above:

So far, we have that the volume of NO2 to be produced (15 L) corresponds to 0.525 mol under the conditions of pressure and temperature provided.

2) Next, we use the chemical reaction to calculate the number of moles of O2 required to produce 0.525 mol of NO2.

From the reaction, we have that 1 mol of O2 leads to 2 mol of NO2. Then, we use this to calculate how many moles of O2 would produce 0.525 moles of NO2:

1 mol O2 --------------- 2 mol NO2

x -------------------------- 0.525 mol NO2

Solving for x, we have:

Now, we know that 0.263 moles of O2 are necessary to produce 15 L of NO2

3) The last step is calculate the mass of O2 that corresponds to 0.263 moles of this compound.

To do this, we need the molar mass of O2. Since the atomic mass of oxygen is 15.99 u, the molar mass of O2 is:

molar mass O2 = (2 * 15.99) = 31.98 g/mol

With this information, we can calculate the mass of 0.263 moles of O2:

1 mol O2 -------------------- 31.98 g O2

0.263 mol O2 ------------ y

Solving for y, we have:

Therefore, the mass of O2 necessary to produce 15 L of NO2 under the conditions given is 8.41 g.

The maximum length of gold foil could be 1171.7 cm made from 1.10 x 10³ g of gold.

The density of an object can be described as the mass per unit volume. The average density is equal to the total mass divided by its total volume.

The mathematical formula of the density of the material can be expressed as follows:

Density = Mass/Volume

The density of a substance is an intrinsic property as it doesn't depend on its size and the S.I. unit of the density is Kg/m³.

Given the width of the gold foil, w = 304 mm = 30.4 cm

The height or thickness of the foil, h = 0.016 mm = 0.0016 cm

The density of the gold foil, d = 19.3 g/cm³

The mass of the gold given, m = 1100 g

The volume of the foil = m/d = 1100/ 19.3 = 56.99 g/cm³

As we know that the volume of  gold foil , V = l × w × h

l = V/(w × h)

l = 56.99/(30.4 × 0.0016)

l =1171.7 cm

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Answer:

b. Double displacement.

Explanation:

It is a double displacement reaction, because in this case, hydrogen atom in HBr is replaced by a sodium atom (from NaOH), and the sodium atom (in NaOH) is replaced by another H atom from HBr molecule, to form H2O.

A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

given that :

weight of gold , m= 10.7 g

temperature, T = 19.8 °C

weight of iron , m = 18.7 g

temperature, T = 53.3 °C

final temperature t = ?

specific heat for gold , c = 0.12 J/ g °C

specific heat for iron , c =  0.45 J/ g °C

now, using the specific heat formula we get :

( mc ΔT ) + ( mc ΔT ) = 0

( 10.7 × 0.12 ×( t - 19.8 )  +  ( 18.7 × 0.45 × (t - 53.3 ) = 0

(1.28 t - 25.4) + ( 8.41 t - 448.2 ) = 0

9.69 t = 473.6

t = 48.87 °C

Thus, A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

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