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In coal, pyrites (FeS(2)) is present as ...

In coal, pyrites `(FeS_(2))` is present as a pollution-causing impurity, which is removed by combustion.
`2FeS_(2) + 5O_(2) rarr 4SO_(2) + 2FeO`.
What mass of `H_(2)SO_(4)` can be prepared from `3.0 g` of `Cu_(2) S` if each atom of `S` in `Cu_(2)S` is converted into 1 molecule of `H_(2) SO_(4)`?(Mw of Cu2S = 159 & Mw of H2SO4 = 98)

A

`1.85 g`

B

`68.62 g`

C

`3.85 g`

D

`4.85 g`

Text Solution

Verified by Experts

The correct Answer is:
A
`Cu_(2) S rarr H_(2) SO_(4)`
Weight of `H_(2) SO_(4) = (3.0 g Cu_(2) S)`
`((1 "mol" Cu_(2) S)/(159 g Cu_(2) S))((1 "mol" S)/("mol" S))`
`((98 g H_(2) SO_(4))/("mol"H_(2)SO_(4)))`
`= (3 xx 1 xx 1 xx 98)/(159) = 1.85 g H_(2) SO_(4)`
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