1求出下列物质中标有圆点的元素的化合价：KNO3 Na2CO3 H2SO4 CO Ca(ClO)2 NH3 FeO KMnO4 KClO3 NaNO2 Al2(SO4)3 2石英砂的主要成分是二氧化硅()二氧化硅中硅元素的化合价为 3在中根据质量守恒定律X的化学式为 4二氧化氯(ClO2)已

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