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From the equation C + 2H2SO4 → CO2 + 2H2O + 2SO2 

Calculate: 

(i) The mass of carbon oxidized by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98). 

(ii) The volume of sulphur dioxide measured at stp. liberated at the same time. (Volume occupied by 1 mole of a gas at stp is 22.4 dm3)

1 Answer

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(i) 

Element Percentage At. Mass Relative No. of atoms Simplest ratio
C 14.4 12 14.4/12 = 1.2 1.2/1.2 = 1
H 1.2 1 1.2/1 = 1.2 1.2/1.2 = 1
Cl 84.5 35.5 84.5/35.5 = 2.4 2.4/1.2 = 2

Emprical formula = CHCl2

(ii) Relative molecular mass = 168

Molecular formula = (Empirical formula)n

= (CHCl2)2 

= C2H2Cl4

(iii) By addition reaction.

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