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Standard XII

Chemistry

Stoichiometric Calculations

What weight o...

Question

What weight of $C a C O_{3}$ must be decomposed to produce a sufficient quantity of carbon dioxide to convert $21.2 g$ of $N a_{2} C O_{3}$ completely into $N a H C O_{3}$ . (Molar mass of $N a = 23 g/mol, C a = 40 g/mol$ ):
$C a C O_{3} \to C a O + C O_{2}$ $N a_{2} C O_{3} + C O_{2} + H_{2} O \to 2 N a H C O_{3}$

100 g

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20 g

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120 g

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30 g

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Solution

The correct option is B $20 g$
$C a C O_{3} \to C a O + C O_{2}$
$N a_{2} C O_{3} + C O_{2} + H_{2} O \to 2 N a H C O_{3}$

Mol of $N a_{2} C O_{3} = \frac{21.2}{106} = 0.2 mol$

1 mol of $N a_{2} C O_{3}$ reacts with 1 mol of $C O_{2}$ and
1 mol of $C O_{2}$ is produced from 1 mol of $C a C O_{3}$
i.e. $mol of N a_{2} C O_{3} = mol of C O_{2} = mol of C a C O_{3}$

So, 0.2 mol of $N a_{2} C O_{3}$ reacts with 0.2 mol of $C O_{2}$ which means 0.2 mol of $C O_{2}$ is produced from 0.2 mol of $C a C O_{3}$ .
weight of $C a C O_{3}$ formed = Moles $\times$ Molar mass
hence, weight of $C a C O_{3} = 0.2 mol \times 100 g/mol = 20 g$

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Similar questions

Q. What weight of

C a C O_{3}

must be decomposed to produce a sufficient quantity of carbon dioxide to convert

21.2 g

N a_{2} C O_{3}

completely into

N a H C O_{3}

. (Molar mass of

N a = 23 g/mol, C a = 40 g/mol

C a C O_{3} \to C a O + C O_{2}

N a_{2} C O_{3} + C O_{2} + H_{2} O \to 2 N a H C O_{3}

Q. What weight of

C a C O_{3}

must be decomposed to produce the sufficient quantity of carbon dioxide to convert 21.2 kg of

N a_{2} C O_{3}

completely into

N a H C O_{3}

[Atomic mass

N a = 23

C a = 40

]

C a C O_{3} \to C a O + C O_{2}

N a_{2} C O_{3} + C O_{2} + H_{2} O \to 2 N a H C O_{3}

Q. Find out the weight of calcium carbonate that must be decomposed to produce sufficient quantity of carbon dioxide to convert 10.6gm of sodium carbonate completely into sodium bocarbonate.

Q. How many grams of calcium carbonate are required to produce enough carbon dioxide which can convert

0.5

mol of sodium carbonate into sodium bicarbonate?

C a C O_{3} ⟶ C a O + C O_{2}

N a_{2} C O_{3} + H_{2} O + C O_{2} ⟶ 2 N a H C O_{3}

The equations given below relate to the manufacture of sodium carbonate (Molecular weight of Na₂CO₃ = 106).
NaCl + NH₃ + CO₂ + H₂O $\overset{}{\to}$ NaHCO₃ + NH₄Cl
2NaHCO₃ $\overset{}{\to}$ Na₂CO₃ + H₂O + CO₂
Questions (a) and (b) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHCO₃ = 84)?
(b) To produce the mass of sodium hydrogen carbonate, calculate what volume of carbon dioxide, measured at STP would be required?

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Stoichiometric Calculations

Standard XII Chemistry

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What weight of CaCO3 must be decomposed to produce a sufficient quantity of carbon dioxide to convert 21.2 g of Na2CO3 completely into NaHCO3. (Molar mass of Na=23 g/mol,Ca=40 g/mol): CaCO3→CaO+CO2 Na2CO3+CO2+H2O→2NaHCO3