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Laws of Chemical Combination

When x g of N...

Question

When $x g$ of $N a H C O_{3}$ is heated, $12.62 g$ of $N a_{2} C O_{3}$ , $5.24 g$ of $C O_{2}$ and $2.14 g$ of $H_{2} O$ were produced. What is $x$ ?

20.00 g

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15.00 g

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17.86 g

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12.64 g

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Solution

The correct option is A 20.00 g
Applying law of conservation of mass,
total mass of the reactants is equal to the total mass of the products.
Mass of $N a H C O_{3} =$ mass of $N a_{2} C O_{3}$ + mass of $C O_{2}$ + mass of $H_{2} O$

Total mass $N a_{2} C O_{3}$ produced $= 12.62 g$
Total mass of $C O_{2}$ produced $= 5.24 g$
Mass of $H_{2} O$ produced $= 2.14 g$
Total mass of $N a H C O_{3}$ heated $(x) = 12.62 + 5.24 + 2.14 = 20 g$

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