Problem: A sample of H2SO4 contains 2.02 g of hydrogen, 32.07 g of sulfur, and 64.00 g of oxygen. How many grams of sulfur and grams of oxygen are present in a second sample of H2SO4 containing 7.27 g of hydrogen?

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We’re being asked what would be the amount of sulfur and oxygen in a sample of H2SO4.  Based on the Law of Definite Proportions, all samples of a compound, no matter on their origin or preparation has the same ratio in terms of their elements.

H2SO4 Sample 1:                   H2SO4 Sample 2:

H         2.02 g                          H         7.27 g H

S          32.07 g                        S          ?

O         64.00 g                        O         ?

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A sample of H2SO4 contains 2.02 g of hydrogen, 32.07 g of sulfur, and 64.00 g of oxygen. How many grams of sulfur and grams of oxygen are present in a second sample of H2SO4 containing 7.27 g of hydrogen?