10.3 Percent Composition Def: Relative amounts of the different elements in a compound What percent of water is hydrogen? oxygen?

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Presentation transcript:

10.3 Percent Composition Def: Relative amounts of the different elements in a compound What percent of water is hydrogen? oxygen?

Different compounds have different percentages of the same elements Based on the chemical formula or recipe

Formula to calculate percent mass: Percent mass = mass of element of element mass of compound X 100%

Sample problems: from mass 1. When a 13.60 g sample of a compound with magnesium oxide is decomposed, 5.4 g of oxygen is obtained. What is the percent composition of this compound? First find total mass Next find mass of each element Answer: 60.3 % Mg and 39.7 % O

2. Calculate the percent composition when 13. 3 g of Fe combine with 5 2. Calculate the percent composition when 13.3 g of Fe combine with 5.70 g of O. Find total mass. Find mass of each element. Answer : 70.0 % Fe and 30.0% O

Sample problems: from formula 1. Calculate the percent composition of propane, C3H8. Find the total mass Find the mass of each element Answer: 82% C and 18% H