Question

how many grams of calcium oxide is obtained on heating 100g of caco3

Answer 1

CaCo3 give CaO and Co2 on heating.
Given that CaCo3=100g(molecular mass)
Therefore mass of CaO is 40×1+16×1=56(molecular mass)

Answer 2

Answer : The calcium oxide obtained is 56 g.

Solution : Given,

Mass of $CaCO_3$ = 100 g

Molar mass of $CaCO_3$ = 100 g/mole

Molar mass of $CaO$ = 56 g/mole

First we have to calculate the moles of $CaCO_3$.

Moles of $CaCO_3$ = $\frac{\text{ Mass of}CaCO_3}{\text{ Molar mass of}CaCO_3}=\frac{100g}{100g/mole}=1mole$

The balanced chemical reaction is,

$CaCO_3\overset{\Delta}\rightarrow CaO+CO_2$

From the given reaction, we conclude that

1 mole of $CaCO_3$ gives 1 mole of $CaO$

So, the mole of $CaO$ = 1 mole

Now we have to calculate the mass of $CaO$.

Mass of $CaO$ = Moles of $CaO$ × Molar mass of $CaO$

Mass of $CaO$ = (1 mole) × (56 g/mole) = 56 g

Therefore, 56 g of calcium oxide is obtained on heating 100 g of $CaCO_3$.