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Question

The weight of NaCl decomposed by 4.9 g of H2SO4, if 6 g of sodium hydrogen sulphate and 1.825 g of HCl, were produced in the reaction is:

A
6.921 g
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B
4.65 g
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C
2.925 g
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D
1.4 g
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Solution

The correct option is A 2.925 g
NaCl+H2SO4NaHSO4+HCl
Given Mass: x 4.9 g 6 g 1.825 g
Molecular weight: 58.5 g 98 g 120 g 36.5 g
Moles: x58.5 0.05 0.05 0.05
Therefore, 0.05 moles of reactant are reacting produce 0.05 moles of each of the product.
Therefore, Amount of NaCl consumed: x58.5=0.05
x=2.925 g

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