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Mass% is the ratio of elements in a given quantity.
if you mix 20 parts of A with 30 parts of B
you will have a solution with 50 parts AB
so take the quantity of A (20) and divide it by the total volume (50) and multiply by 100. This means you have 40% of A in your solution.
likewise with B (30/50) x 100 = 60% by mass
before not to confuse %mass with mole ratio as this is significantly different
Jimmy Mueller
Wiki User
∙ 14y ago20 per cent by mass means 20 per cent by weight. The contents of a mixture are usually expressed as percentages by volume, but it sometimes makes more sense to describe it by weight.
It doesn't really make too much sense to use a percentage by mass. The difference between mass and weight is only significant when the gravitational field is not constant. Even if the gravitational field were to vary across the mixture, any part of it would still have the same composition, whether measured by mass or by weight.
Wiki User
∙ 13y agoExample: sodium chloride, NaCl
1. Search the atomic masses of sodium and chlorine in chemical tables;
Na - 22,989 769 28 and Cl - 35,45 (abridged).
2. Calculate the molecular mass of NaCl: Na + Cl = 58,43976928 = 58,44 (abridged)
3. Calculate the percentage of sodium:
58,44 g NaCl--------------22,99 g Na
100 g NaCl----------------x
x = 22,99.100/58,44 = 39, 34 % Na
4. Calculate the percentage of chlorine:
100 - 39,44 = 60,56 % Cl
Wiki User
∙ 8y agoPercent mass = (Mass solute/Mass solution) X 100%
Wiki User
∙ 10y agoThis is the concentration of a component in a material expressed in mass percentage.
Example: a type of coal has 15 % ash. The meaning is 15 g ash in 100 g coal.
Wiki User
∙ 14y ago(Mass of Solute/Mass of Solution)X 100%
Wiki User
∙ 12y agososo na malaki
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What is the empirical formula of a compound that contains 75 percent Ag and 25 percent Cl by mass?
AgCl
Explain why the percent composition of certain compounds are not sufficient to determine the compounds molecular formulas?
Because unlike the empirical formula, the molecular formula does not have to be the simplest ratio.If by chance you are given the percent composition of the elements in a substance, you could calculate the empirical formula and then the empirical formula's mass. However, the molecular formula equation is molecular formula= (empirical formula)n, where n is the mass of the molecular formula divided by the mass of the empirical formula. You would, therefore, need to know the mass belonging to the molecular formula, which you are not given.
What is the formula for the percent by mass of a compound?
((mass of element)/(mass of compound))*100
An unknown sample with a molecular mass of 180.0g is analyzed to yield 40 percent C 6.7 percent H and 53.3 percent O What is the empirical formula and the molecular formula of this compound?
ch2o and c6h12o6
Can you Calculate the empirical formula of the compound made from 43.4 percent Na 11.3 percent C and 45.3 percent O by mass enter the empirical formula?
Firstly divide percentages by molar mass of that elementNa43.4/23=1.9C11.3/12.01=0.94O45.3/16=2.83Then divide the result of the first step by the smallest answerNa1.9/.94=2C.94/.94=1O2.83/.94=3Empirical Formula is Na2CO3
What is the formula for calculation mass and mass percent?
gaga si cherywel
What is the formula of the percent of volume and percent of mass?
% of volume = 100*(volume of substance that you are interested in)/(total volume) % of mass = 100*(mass of substance that you are interested in)/(total mass).
If a compound containing chromium and silicon has 73.52 mass percent chromium what is its empirical formula?
Cr3Si2 is the empirical formula for a compound containing chromium and silicon an has 73.52 mass percent chromium.
In which compound is the percent composition by mass of chlorine equal to 42 percent?
HClO3 (gram-formula mass = 84 g/mol)
What information is needed to calculate the percent composition of a compound?
The formula of the compound and the Atomic Mass of its elements.
What is the empirical formula of a compound that contains 20 percent calcium and 80 percent bromine by mass?
CaBr2 :)
What is the empirical formula of a compound that contains 75 percent Ag and 25 percent Cl by mass?
AgCl
Explain why the percent composition of certain compounds are not sufficient to determine the compounds molecular formulas?
Because unlike the empirical formula, the molecular formula does not have to be the simplest ratio.If by chance you are given the percent composition of the elements in a substance, you could calculate the empirical formula and then the empirical formula's mass. However, the molecular formula equation is molecular formula= (empirical formula)n, where n is the mass of the molecular formula divided by the mass of the empirical formula. You would, therefore, need to know the mass belonging to the molecular formula, which you are not given.
What is the percent of sulphur in ammonium sulphate?
The formula of ammonium sulphate is (NH4)2SO4, showing that each formula mass contains one sulphur atom. The formula mass of ammonium sulphate is 132.13, and the gram atomic mass of sulphur is 32.06. Therefore, the percent by mass of sulphur in ammonium sulphate is 100(32.06/132.13) or 24.26, to the justified number of significant digits.
What is the formula for the percent by mass of a compound?
((mass of element)/(mass of compound))*100
An unknown sample with a molecular mass of 180.0g is analyzed to yield 40 percent C 6.7 percent H and 53.3 percent O What is the empirical formula and the molecular formula of this compound?
ch2o and c6h12o6
What is the empirical formula of an oxide of Bromine which contains 71.4 percent Bromine by mass?
BrO2
