1.解,设生成71g五氧化二磷需要氧气X克,红磷y克：4 P + 5 O2 =点燃= 2 P2 O5124 160 284 y g x g 71g124/284=yg/71g Y=124*71g/284 y=8804g/284=31g160/254=xg/71g X=160*71g/284 x=11360g/284=40g答:生成71g五氧化二...