Considering the definition of atomic mass, isotopes and atomic mass of an element, the atomic mass of the element is 12.1 amu.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes.
In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, the first isotope has an atomic mass of 12 amu and a percent natural abundance of 95 %. The second isotope has an atomic mass of 14 amu and a percent natural abundance of 5 %.
Then, the average mass can be calculated as:
12 amu×0.95 + 14 amu×0.05= 12.1 amu
Finally, the atomic mass of the element is 12.1 amu.
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What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
A
Explanation:
What cell structure is best represented by the image?
A.
a permeable exoskeleton
B.
a waterproof nuclear envelope
C.
a non-permeable cell wall
D.
a selectively permeable membrane
Which substances are contained in saliva and tears to break down pathogens?
enzymes
acids
oils
sweat
Answer:
A. Enzymes
Explanation:
Enzymes are in our saliva and tears. They help break down pathogens and the cell wall of bacteria.
I hope it helps! Have a great day!
Muffin~
Answer:
A. Enzymes.
Explanation:
Enzymes break down things and they are in both our saliva and tears.
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If you want to produce 18.48 grams of NaCl what is the minimum amount of each reactant that you must start with
The minimum amount of NaOH and HCl that must be present to produce 18.48grams of NaCl is 12.6g and 11.5g respectively.
Calculation of amount of reactantsThe balanced neutralization reaction equation for the formation of NaCl is,
NaOH + HCl ---> NaCl + H2
The molar mass of NaOH = 23+16+1 = 40g/mol
The molar mass of NaCl = 23 +35.5 = 58.5g/mol
If 40g of NaOH = 58.5g of NaCl
∴ x g of NaOH = 18.48g of NaCl
Make xg the subject of formula,
x g of NaOH = 40 × 18.48/58.5
= 739.2/58.5
= 12.6g of NaOH
The molar mass of HCl = 1 +35.5 = 36.5g/mol
If 36.5g of HCl= 58.5g of NaCl
∴ x g of HCl = 18.48g of NaCl
Make xg the subject of formula,
x g of HCl = 36.5 × 18.48/58.5
= 674.52/58.5
= 11.5g of HCl
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What percentage of Earth's land is used for agriculture?
40%
20%
50%
10%
Answer:
40%
Explanation:
hope it helps! God bless
Answer:
40% of Earth's land is used for agriculture.
What are the 10 most important chemical reactions?
Choose ALL correct answers
A.) Combustion of methane (hydrocarbons)
B.) Photosynthesis.
C.) Synthesis of sulfuric acid.
D.) Equilibrium of carbonic acid and carbon dioxide gas.
E.) Biological formation of calcium carbonate.
F.) Rusting of iron.
G.) Production of hydrogen from the action of acid on metal.
H.) Oxidation of alcohol.
I.) Decomposition.
J.) Redox.
Answer:
Combustion of methane (hydrocarbons)
Photosynthesis.
Synthesis of sulfuric acid.
Equilibrium of carbonic acid and carbon dioxide gas.
Biological formation of calcium carbonate.
Rusting of iron.
Production of hydrogen from the action of acid on metal.
Oxidation of alcohol.
Explanation:
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1. explain how u would test the presence of oxygen and hydrogen gases
2. explain how u can get the most accurate reading in titration
3. why is scientific method important in chemistry? state your opinion
4. you are given a bucket of ice cubes, a little sugar, a measuring cylinder and a stopwatch.Plan a experiment to determine whetther sugar increases the melting rate of ice
A 300 L sample of hydrogen was compressed to a volume of 200 L at STP. If the initial temperature is 35.0 °C,
what was the initial pressure?
* please show equation!!
brainliest!!
Answer:
76.210kPa
Explanation:
[tex] \frac{p1v1}{t1} = \frac{p2v2}{t2} \\ p1 = \frac{p2v2t1}{v1t1} \\ p1 = \frac{101.325 \times 200 \times 308}{300 \times 273} \\ p1 = 76.210kpa[/tex]
pls help me to answer this:(
Answer:
How do one confess feelings to her if he is introvert?
A teacher drops a bottle containing sodium chloride. The bottle breaks when it
hits the floor. The teacher sweeps up the mixture of sodium chloride and glass.
Describe how the teacher can obtain a pure, dry sample of sodium chloride from
the mixture.
The mixture of sodium chloride and broken glasses can be separated by dissolution, filtration, and evaporation respectively.
Separation of mixtureThe mixture containing sodium chloride and broken glasses can be separated as follos:
First, by dissolving the mixture in water. The soluble sodium chloride will dissolve while the broken glasses will remain insoluble.Filteration is carried out to filter off the broken glassesThe filtrate which is now a mixture of water and sodium chloride can then be heated to evaporate off the water and to obtain dry sodium chloride.More on separating mixtures can be found here: https://brainly.com/question/863988
A compound contains only aluminum and carbon. 0.03 moles of this compound reacted with excess water to form 0.12 moles of AI(OH)3 and 0.09 moles of CH4 write a balanced equation for this reaction.
Explanation:
4Al+3C+H2O→4Al(OH)3+3CH4
Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4
If 25.0 g of NO are produced how many liters,at STP,of nitrogen gas are used?
Answer:
9 1/3 liters
Explanation:
N2 + O2 = 2 NO
Find mole weights from table of elements
N =14
O =~16 30 gm is a mole
22.4 l / mole for gases at STP
22.4 * 25/30 = 18 2/3 Liters of NO
but since Nitrogen is N2 it will take 1/2 s much = 9 1/3
*** EDITED ***
According to the stoichiometry and STP conditions if 25.0 g of NO are produced 2269 liters of nitrogen gas are used.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.1 mole of nitrogen gives 2 moles of NO, thus as per ideal gas equation which on substitution gives V=1×8.314×273/1=2269.722 liters.
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Which substance have the same number of carbon (C) atoms?
Answer:
Carbon monoxide
Explanation:
Carbon dioxide and carbon monoxide have the same number of carbon atoms.
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When the maturities of a bond issue are spread over several dates, the bonds are called.
What happens to the temperature of a gas when it is compressed?.
SOMEONE HELP! 100 points have only 2 minutes!
How will different pH levels provide more information?
The neutral phase of a ph scale is 7.
A ph higher than 7 indicates that the substance is basic in nature.
14 is the most basic and 8 is the least basic
A ph lower than 7 indicates the substance is acidic in nature.
1 is the most acidic and 6 is the least acidic.
Pls help with question 10
Answer:
Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)
Explanation:
Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g
Given equation n=m/M ,
n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles
∴ x=0.318520677 moles
∴ Molecular mass (hydrated sodium sulfate) =
= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]
= 147.77415g/mol
Answer:
Answer is in the attachment:
x=10
Explanation:
Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
Answer:
Are molecules atoms that are chemically bonded together?
Image result for Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
If this interaction is such that the total energy of the system is lowered, then the atoms bond together to form a molecule. Thus, from a structural point of view, a molecule consists of an aggregation of atoms held together by valence forces. Diatomic molecules contain two atoms that are chemically bonded.
Explanation:
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How many nitrate ions are in 2 mol of iron (II) nitrate
Answer:
Two
Explanation:
Nitrate has a charge of negative 1 and the Iron (II) tells us the iron in that formula has a charge of +2, so in order for the iron to have to equal positive two, there has to be two negative. Since on nitrate ion is -1, you need two to make -2.
What is the density of a substance with a mass of 20.0 g and a volume of 4.0 mL?
Answer:
20÷4=5g/ml, bcz it is in mL but in other situations you will need to convert it to L by dividing it by 1000
Mass= 20.0g
Volume= 4.0mL
To Find,Density of substance
We Know,[tex]\text{Density} = \frac {\text{Mass}}{ \text{Volume}}[/tex]
Inserting The Values[tex] \text{Density} = \frac{20.0 \text{ \: g}}{4.0 \: \text{mL}} \\ \\ \text{Density} = \frac{ \cancel{20.0}\text{ \: g}}{ \cancel{4.0} \: \text{mL}} \\ \\ \text{Density} = 5.0 \: \text{g/mL}[/tex]
[tex]\therefore \text{Option B}= 5.0 \: \text{g/mL is the correct answer}[/tex]
Hope this helpsThe changes in the mass of the egg and volume of liquid in the beaker are inversely proportional. This demonstrates that _______ is moving from one area to another.
The changes in the mass of the egg and volume of liquid in the beaker are inversely proportional. This demonstrates that volume is moving from one area to another.
What is osmosis?Osmosis is a process in which solvent molecules will move from the higher concentration area to the lower concentration area.
When we put egg in any vessel where water is present then water molecule will move into the egg molecule as a result of the osmosis and due to this mass is inversely proportional to the volume. In this phenomenon water is moving from one area to another due to osmosis.
Hence volume is moving from one area to another.
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Write down the word equation for the production of the following salts. Remember to include ALL reactants and ALL products.
2.1 Lithium nitrate, using Lithium carbonate.
2.2 Magnesium chloride using magnesium metal
Answer:
The reaction between methane and oxygen to yield carbon dioxide and water (shown at bottom) may be represented by a chemical equation using formulas (top).
Explanation:
The substances undergoing reaction are called reactants, and their formulas are placed on the left side of the equation.
The substances generated by the reaction are called products, and their formulas are placed on the right sight of the equation.
Plus signs (+) separate individual reactant and product formulas, and an arrow (⟶) separates the reactant and product (left and right) sides of the equation.
The relative numbers of reactant and product species are represented by coefficients (numbers placed immediately to the left of each formula). A coefficient of 1 is typically omitted.
Can animals detect radio waves
Answer:
No.
Explanation:
No organism can detect X-rays or radio waves
Answer:
no
Explanation:
Many animals, including vampire bats and certain fish and snake species, are able to sense infrared radiation, but this only goes up to wavelengths of 1mm. Longer wavelengths carry much less energy and can't be detected without some kind of resonator to amplify the signal.
A dock worker uses a pulley system to raise a boat onto a dock. the pulley system has a mechanical efficiency of 73 %. the boat has a weight of 950 n. the pulley system lifts the boat 5 m into the air. how many newton-metres of work does the dock worker have to exert to lift the boat?
The work (newton-metres) the dock worker have to exert to lift the boat to 5 m in air is 6506.85 Nm
What is work done?This is simply defined as the product of force and distance moved in the direction of the force. Mathematically, it can be expressed as
Workdone (Wd) = force (F) × distance (d)
Wd = Fd
How to determine the output work done Force (F) = 950 NDistance (d) = 5 mOutput work =?Output work = Fd
Output work = 950 × 5
Output work = 4750 Nm
How to determine the input work done Output work = 4750 NmEfficiency = 73%Input work =?Efficiency = (output / input) × 100
73% = 4750 / input
0.73 = 4750 / input
Cross multiply
0.73 × input = 4750
Divide both side by 0.73
Input work = 4750 / 0.73
Input work = 6506.85 Nm
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HELP!!!
Find the volume of a balloon of gas at 842 mm Hg and –23oC, if its volume is 915 mL at a pressure of 1170 mm Hg and a temperature of 24oC.
(I will give brainliest! Thank you so much!)
Answer:
2.54kpa
Explanation:
p*v/t = constant
6.58/539=p2/2111
p2=211(6.50/539)
Answer:
2.53kpa
Explanation:
p1*v1/t1 = constant
the constant can be changed to p2*v2/t2
v2 can be removed from equation as it is constant
The half-life of cobalt-60 is 5 years. How old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?.
[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]
Nt/No = 1/8
T = duration of decay
t 1/2 = half-life
[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]
7. Complete the following equations. [2]
a. Sodium + Water ______________________ + Hydrogen
b. Copper carbonate + Sulfuric acid _____________________ +_____________ + Carbon dioxide
c. Sulfur + _________________ Sulfur dioxide
Answer:
Sodium + water --› Sodium hydroxide + hydrogen gas
Copper carbonate + sulphuric acid --› Copper sulphate + water + carbondioxide
Sulphur + Oxygen --› Sulphur dioxide
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How much would a 10 kg suitcase weigh on the surface of…? a. The Moon b. Mars c. Saturn d. Pluto
Answer:
Is this the full question
Explanation:
Reply or love the message so i can get a notification
Time (sec) [CH4] (mol/L)
0 1.2
20 1.0
40 0.9
60 .85
CH4 (g) + O2 (g) -----> CO2 (g) + H2O (l)
Given the above table and equation above, calculate the average rate of consumption of oxygen from time 20 seconds to time 60 seconds.
Based on the table and the equation of reaction; the
rate of consumption of oxygen between time 20 and 40s is 0.005 M/srate of consumption of oxygen between time 40 and 60s is 0.0025 M/sWhat is rate of a reaction?The rate of a reaction is the rate at which reactants molecules are consumed or products are formed.
Rate of reaction = change in concentration of reactants or products/ time takenBased on the equation of reaction, the rate of consumption of oxygen is equal to the rate of consumption of methane.
Thus. rate of consumption of oxygen from time 20 seconds to time 60 seconds is calculated as follows:
Rate between 20 and 40 = 1.0 - 0.9/20
Rate of consumption of oxygen = 0.005 M/sRate between 40 and 60 = 0.9 - 0.85/20
Rate of consumption of oxygen = 0.0025 M/sTherefore, the rate of consumption of oxygen decreases with time.
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Consider the balanced equation below.
2H2S + 3O2 Right arrow. 2SO2 + 2H2O
Which option gives the correct mole ratios?
H2S:SO2 = 2:2 and O2:H2O = 3:2
H2S:SO2 = 2:3 and O2:H2O = 3:2
H2S:SO2 = 4:4 and O2:H2O = 5:4
H2S:SO2 = 4:6 and O2:H2O = 4:4
Answer:
4:6 and 4:4
Explanation:
double the right side so double the left side to get these ratios
Draw the major product of the given reaction. Include minimized formal charges.
The major product of the given chemical reaction is given as drawn in the attached picture.
What is a Major Product in Chemistry?A major product in chemistry refers to the product whose amount is the greatest after a chemical reaction has taken place.
In order to find the major product, it is required for the Markovnikov Rule to be applied.
This rule states that when hydrogen is mixed with carbon with more hydrogen, then the major product will be gotten.
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