Molar volume of any gas at STP = 22.4 L/mol
So,
Mol of CO2 produced = volume /molar volume
= 183 L / 22.4 L/mol
= 8.17 mol
From reaction,
Mol of MgCO3 reacted = mol of CO2 produced
= 8.17 mol
Molar mass of MgCO3,
MM = 1*MM(Mg) + 1*MM(C) + 3*MM(O)
= 1*24.31 + 1*12.01 + 3*16.0
= 84.32 g/mol
use:
mass of MgCO3,
m = number of mol * molar mass
= 8.17 mol * 84.32 g/mol
= 689 g
Answer: 689 g
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