含有二氧化硅的黄铁矿试样1克,在氧气中充分灼烧后残余固体为0.76克,该黄铁矿纯度为?

问题描述:

含有二氧化硅的黄铁矿试样1克,在氧气中充分灼烧后残余固体为0.76克,该黄铁矿纯度为?

4FeS2 + 11O2 = 2Fe2O3 + 8SO2 dm
4*(56+32*2) 160
x 1-0.76
x=4*(56+32*2)*(1-0.76)/160=0.72 g
黄铁矿纯度==0.72/1=72%