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Calculate the number of moles in each of the following. (i) 392 g of sulphuric acid (ii) 44.8 litres of sulphur dioxide at N.T.P. (iii) 8g of calcium |
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Answer» Number of moles = Mass of SUBSTANCE / Mass of one mole.(i)4 mol(II)2 mol(iii)0.2 molExplanation:(i)molar mass of H2HSO4=98 g98 g H2HSO4=1 mol392 g of H2HSO4=(1 mol/98 g)*(392 g) = 4 mol(ii)22.4 L of S02 at NTP=1 mol44.8 L of S02 at NTP=(1 mol/22.4 L)*44.8 L) = 2.0 mol(iii)atomic mass of Ca=40 g40 g of CALCIUM=1 mol8 g of calcium=(1 mol)*(8g/40 g) =0.2 mol |
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