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Question

1 gram of a carbonate (M2CO3) on treatment with excess HCl produces 0.01186 moles of CO2. The molar mass of (M2CO3) in gmol1 is:

A
84.3
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B
118.6
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C
11.86
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D
1186
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Solution

The correct option is A 84.3
M2CO3+2HClCO2+2MCl+H2O

Moles of M2CO3 = Moles of CO2 produced.

Moles of M2CO3=wmolar mass=0.01186

Weight of the carbonate (w) = 1 g

Moles of M2CO3=1molar mass=0.01186

Molar mass =84.3 gmol1

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