1.

xFeS2 + yO2 -> zFe2O3 + wSO2, what is the value of x + y + z + w?(a) 16(b) 21(c) 25(d) 32

Answer» Correct option is (c) 25

The best explanation: The balanced chemical reaction is 4FeS2 + 11O2 -> 2Fe2O3 + 8SO2, => x + y + z + w = 25.


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