Question

If 25g of calcium carbonate is heated calculate the number of moles of calcium carbonate used

Answer 1

If 25g of calcium carbonate is heated then 0.24moles calcium carbonate is used

Answer 2

Given:

Compound used = Calcium carbonate

Mass of the compound = 25g

To find:

Number of moles of Calcium carbonate used = ?

Formula to be used:

Moles = $\frac{Given mass}{Molar mass}$

Calculation:

To find moles, the molar mass of CaC$O_3$ must be identified. Accordingly

Molar mass of CaC$O_3$ = 1(Ca)+1(C)+3(O)

Molar mass of CaC$O_3$ = 1 (40)+ 1(12) + 3(16)

Molar mass of CaC$O_3$ = 40+12+48

Molar mass of CaC$O_3$ = 100g

Substituting the obtained value in moles formula, it gives:

Moles =  $\frac{Given mass}{Molar mass}$ = $\frac{25}{100} = 0.25$

Conclusion:

Thus it is inferred that if 25g of calcium carbonate is heated 0.25 moles of calcium carbonate.

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