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50g of caco3 decomposes on heating to give cao and 20g off co2? The approximate purity of caco3 is |
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Answer» nfo : 50g of CaCO3 decomposes on HEATING to GIVE cao and 20G off CO2 gas. To find : the approximate purity of CaCO3 is....Solution : decomposition of CaCO3 is .. CaCO₃ ⇒ CaO + CO₂here we see 1 mole of CaCO3 decomposes into 1 mole of CaO and 1 mole of CO2. 100G of CaCO3 decomposes into 56g of CaO and 44g of CO2. [ molecular WT of CaCO3 = 100g molecular wt of CaO = 56g molecular wt of CO2 = 44g ]So, 20g of CO2 is produced by 100/44 × 20 g = 45.45 g Therefore the impurity in 50g of CaCO3 sample = 50 - 45.45 = 4.55gtherefore percentage purity of CaCO3 = 45.45/50 × 100 = 90.9 ≈ 91 % |
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