Question

Table sugar is a compound known as sucrose. Sucrose is composed of the elements carbon, hydrogen, and oxygen. Analysts is of a 20.0 g of sucrose from a bag of sugar finds that the sugar is composed of 8.44 g of carbon, 1.30 g of hydrogen, and 10.26 g of oxygen. Express, as fractions, the ratio of the mass of each element to the total mass of the sample. Using these ratios, calculate the percent composition by mass of each element in the compound

Answer 1

percent composition of sucrose:

42.2 % carbon

6.5 % hydrogen

51.3 % oxygen

Explanation:

To calculate the percent composition of sucrose, we use the next reasoning:

if in 20 g of sucrose there are 8.44 g of carbon and 1.30 g of hydrogen and 10.26 g of oxygen

then in 100 g of of sucrose there are X g of carbon and Y g of hydrogen and Z g of oxygen

X = (100 × 8.44) / 20 = 42.2 % carbon

Y = (100 × 1.30) / 20 = 6.5 % hydrogen

Z = (100 × 10.26) / 20 = 51.3 % oxygen

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