Question -Calculate the volume of CO2 evolved at NTP when 20g of CaCO3 is heated strongly.
Options:
A .  3.38 L
B .  4.48
C .  5.58 L
D .  6.68 L
Answer: Option B : B The question gives weight of reactants and asks the volume of product. So, it is a weight-volume problem. Start by balancing the reaction CaCO3→CaO + CO2(g)↑ ∴ 1 mole of CaCO3 gives 1 mole of CO2 From Avagadro's Law, 1 mole of CO2 at NTP occupies 22.4L ∴ 1 mole of CaCO3 = 22.4 L of CO2 100g = 22.4L of CO2 ∴ 20g = 20 ×22.4100 = 4.48 L of CO2
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