Problem: A mixture of CaCO3 and (NH4 )2 CO3 is 61.1 % CO3 by mass.Find the mass percent of CaCO3 in the mixture.

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We are asked to find the mass percent of CaCO3 in the mixture.


Assume 100 of the mixture. 


Mass CO3 = 61.1 g

Moles CO3 =61.1 g60 g/mol = 1.02 mol CO3 


Molar mass CaCO3 = 100 g/mol

Molar mass (NH4)CO3 = 96 g/mol


Calculate mass CaCO3 in the mixture:

mass CaCO3100+100 -mass CaCO396 = 1.02 96(mass CaCO3)+10,000 -100(mass CaCO3 )= 9792mass CaCO3 = 52 g


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Problem Details

A mixture of CaCO3 and (NH4 )2 CO3 is 61.1 % CO3 by mass.

Find the mass percent of CaCO3 in the mixture.

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