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Question

A 0.60 g sample consisting of only CaC2O4 and MgC2O4 is heated at 500 o C, converting the two salts of CaCO3 and MgCO3. The sample then weighs 0.465 g. If the sample had been heated to 900 o C and the products are CaO and MgO, what would the mixtures of oxides have weighed?

A
0.12 g
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B
0.21 g
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C
0.252 g
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D
0.3 g
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Solution

The correct option is C 0.252 g
Let x g is wt. of CaC2O4 and (0.6x) g wt. of MgC2O4
CaC2O4CaCO3+CO2
MgC2O4MgCO3+CO2
wt. of CaCO3 produced =x128×100
wt. of MgCO3 produced =(0.6x)112×84
x128×100+(0.6x)112×84=0.465
x=0.48 g
Due to further heating,
CaCO3CaO+CO2 x128
MgCO3MgO+ CO2
(0.6x112)
Putting the value of x and finding wt. of CaO and MgO produced
=0.48128×56+0.12112×40=0.252 g

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