A certain sample of coal contains `1%` of sulphur by weight. What is the weight of sulphur dioxide produced when `2'10^(6)` kg of this coal is burnt?

Options

A. `2xx 10^(4)kg`
B. `4 xx 10^(4)kg`
C. `4 xx 10^(5)kg`
D. `2 xx 10^(5)kg`

Answer

B

Explanation

Weight of sulphur present in coal
`(2 xx 10^(6) xx 1)/(100) = 2 xx 10^(4) kg S +O_(2) rarr SO_(2)`
`32 xx 10^(-2) kg rarr 64 xx 10^(-3) kg. 2xx 10^(4) kg rarr ?`
weight of sulphur dioxide
`=(2 xx 10^(4) xx 64 xx 10^(-3))/(32 xx 10^(-3)) = 4 xx 10^(4) kg`