Sulphurtrioxide is prepared by following two reaction :
(i) `Cu_(2)S + O_(2) rarr Cu_(2) O + SO_(2)`
(ii) `2SO_(2) + O_(2) rarr 2SO_(3)`
How many gram `SO_(3)` of are produced from 159 g of `Cu_(2)S` (Atomic mass of `Cu = 63.5, S = 32, O = 16` g/mole)

Options

A. 64 g
B. 160 g
C. 128 g
D. 80 g

Answer

D

Explanation

(i) `Cu_(2)S + O_(2) rarr Cu_(2) O + SO_(2)`
Mw. of `Cu_(2)S= 159` g/mole
So, 159 g `Cu_(2)S` will produce 1 mole of `SO_(2)(64 g SO_(2))`
(ii) `2SO_(2) + O_(2) rarr 2SO_(3)`
`128 g SO_(2)` will produce `160 g SO_(3)`
`:. 64 g SO_(2)` will produce `80 g SO_(3)`