黄铁矿矿石的主要成分为二硫化亚铁(FeS2)。取一块质量为30克的黄铁矿矿石样品在氧气中完全灼烧后,得到10克氧化铁(其中的铁全来自二硫化亚铁),同时生成二氧化硫。
(1)二硫化亚铁中硫元素的化合价为 。
(2)计算黄铁矿矿石样品中二硫化亚铁的质量分数。
(1)﹣1价。
(2)设黄铁矿矿石样品中二硫化亚铁的质量为x
4FeS2+11O22Fe2O3+8SO2
480 320
x 10g
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