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Stoichiometric Calculations

A 2.00 g. of ...

Question

A 2.00 g. of sample containing $N a_{2} C O_{3}$ and $N a H C O_{3}$ loses 0.248 g when heated to $300^{o} C$ , the temperature at which $N a H C O_{3}$ decomposes .Find % composition of $N a_{2} C O_{3}$ in the mixture ?

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Solution

We can write a balanced chemical equation as:
$2 N a H C O_{3} 168 g \to N a_{2} C O_{3} + C O_{2} 44 + H_{2} O 18$

The loss comes due to evolution of $C O_{2}$ and steam.
62 g loss occurs when the quantity of $N a H C O_{3}$ is 168 g.
0.248 g loss will occur when the quantity of $N a H C O_{3}$
$= \frac{168}{62} \times 0.248 = 0.672 g$

Quantity of $N a_{2} C O_{3}$ in the sample $= (2.0 - 0.672) = 1.328 g$

% of $N a_{2} C O_{3} = \frac{1.328}{2} \times 100 = 66.4$

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Similar questions

2.0

g sample containing

{N a}_{2} C O_{3}

N a H C O_{3}

0.248

g when heated to

300

^{o} C

, the temperature at which

N a H C O_{3}

{N a}_{2} C O_{3}, C O_{2}

H_{2} O

%

{N a}_{2} C O_{3}

in the mixture is (as the nearest integer):

Q. A 2 g sample containing

N a_{2} C O_{3}

N a H C O_{3}

loses 0.62 g when heated to

300^{o} C,

the temperature at which

N a H C O_{3}

N a_{2} C O_{3}, C O_{2}

H_{2} O .

What is the percentage of

N a_{2} C O_{3}

in the given mixture.

Q. A sample contains a mixture of

N a H C O_{3}

N a_{2} C O_{3}

H C l

15.0

g of the sample yielding

11.0

N a C l

. What percent of the sample is

N a_{2} C O_{3}

?
Reactions are:

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

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

Molecular weight of

N a C l

N a H C O_{3}

N a_{2} C O_{3}

58.5

84

106

g/mol respectively.

10

N a H C O_{3}

N a_{2} C O_{3}

1.68

N a H C O_{3}

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Q. 19 g of a mixture containing

N a H C O_{3}

N a_{2} C O_{3}

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N a_{2} C O_{3}

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