# 1. Calculate the mass of SO2 produced when 185 grams of oxygen reacts using this equation: 2Cu2S + 3O2 ----> 2Cu2O + 2SO2 2. If a student decomposes 58.498 grams of aluminum carbonate and she...

1. Calculate the mass of SO2 produced when 185 grams of oxygen reacts using this equation: 2Cu2S + 3O2 ----> 2Cu2O + 2SO2

2. If a student decomposes 58.498 grams of aluminum carbonate and she collects the gas and measures 27.68 grams of carbon dioxide, determine the percent yield for this reaction. Al2(CO3)3 ----> Al2O3 + 3CO2

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As per the rules of enotes, I am to answer only one of your questions. Post other questions in separate threads, one at a time.

The reaction is: 2Cu2S + 3O2 ----> 2Cu2O + 2SO2

Molar mass of SO2 is (32+2*16) = 64.

From the stoichiometry of the above mentioned reaction,

3*2*16 = 96 g oxygen reacts with sufficient Cu2S to produce 2*64 = 128 g SO2.

Therefore, 185 g oxygen should react with sufficient Cu2S to produce 128*185/96 = 246.667 g SO2.

**Therefore, 246.67 g SO2 will be produced when 185 g oxygen react with sufficient Cu2S.**

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