Determine the number of moles of calcium carbonate with 10% impurities, which reacts with 21.9 g of hydrochloric acid.

0.297 moles of calcium carbonate.

Solution:

Number of moles of HCl = moles

According to reaction

Two moles of HCl are reacting with one mole of , then 0.6 moles of HCl will react with:

=

Moles of calcium carbonate reacted = 0.3 moles

In 0.3 moles of calcium carbonate 10% impurities is present i.e.

of impurity.

Actual number of moles of calcium carbonate reacted = 0.3 - 0.003 = 0.297 moles.

the answer is the first option

explanation:

just googled it m8. not that hard

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