Chemistry related question

Question

Complete and balance the equation for the combustion of ZnS in excess oxygen

? ZnS +? O2 -> ? ZnO + ?

Use no fractional coefficients. The number of moles and the formula of the product containing S are

(A)2S

(B)S8

(C) SO2

(D) 2SO2

(E) SO3

Answer 1

ZnS + O₂ ==> ZnO + SO₂ .. unbalanced (note: it is balanced for all elements except O)

ZnS + 1.5 O₂ ==> ZnO + SO₂ .. balanced for all elements, but this is using a fractional coefficient

2 ZnS + 3 O₂ ==> 2 ZnO + 2 SO₂ .. balanced equation using no fractional coefficients.

ANSWER = (D) 2 SO₂