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Laws of Mass Conservation

10.0 g of CaC...

Question

10.0 g of $C a C O_{3}$ on heating gave 4.4 g of $C O_{2}$ and x g of $C a O$ . Applying the law of conservation of mass, calculate the mass of $C a O$ .

6.5 g

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5.6 g

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4.2 g

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5.3 g

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Solution

The correct option is B 5.6 g
According to the law of conservation of mass,
mass of reactants = mass of products
$C a C O_{3} \to C a O + C O_{2}$
10 g x g 4.4 g

Hence x = 10 - 4.4 = 5.6 g

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