In which cases are the law of conservation of mass followed?
A
10 g CaCO3 on heating gives 0.1 mole CaO and 2.24 L CO2 at NTP
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B
1 mole N2 and 1 mole H2 combine to form 2 moles of NH3
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C
0.2 mole SO2 combines with 3.2 g O2 to form 0.2 moles SO3
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D
1 g H2 combines with 0.5 g O2 to form 1.5 g H2O
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Solution
The correct options are A10 g CaCO3 on heating gives 0.1 mole CaO and 2.24 L CO2 at NTP C0.2 mole SO2 combines with 3.2 g O2 to form 0.2 moles SO3 The Law of Conservation of Mass:
In a chemical change total mass remains conserved,i.e. mass before reaction is always equal to mass after reaction. 10 g CaCO3 (0.1 mole) on heating gives 0.1 mole CaO(5.6g) and 2.24LCO2 (0.1 mole = 4.4g) at NTP. 0.2 mole (12.8g) SO2 combines with 3.2gO2 (0.1mole) to form 0.2 moles (16g) SO3. 2SO2+O2→2SO3