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Problem: A 6.54 g sample of a mixture of magnesium carbonate and calcium carbonate is treated with excess hydrochloric acid. The resulting reaction produces 1.73 L of carbon dioxide gas at 28 oC and 744 torr pressure.Assuming that the reactions are complete, calculate the percentage by mass of magnesium carbonate in the mixture.

FREE Expert Solution

Step 1

PV = nRTn = PVRT


n = (744 torr×1 atm760 torr)(1.73 L)(0.08206 atm·Lmol·K)(28°C+273.15)K

n = 0.0685 mol CO2


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Problem Details

A 6.54 g sample of a mixture of magnesium carbonate and calcium carbonate is treated with excess hydrochloric acid. The resulting reaction produces 1.73 L of carbon dioxide gas at 28 oC and 744 torr pressure.

Assuming that the reactions are complete, calculate the percentage by mass of magnesium carbonate in the mixture.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Gas Stoichiometry concept. If you need more Gas Stoichiometry practice, you can also practice Gas Stoichiometry practice problems.