P → Ca3P2 → PH3 → P2O5
1) 2P + 3Ca => Ca3P2
2) Ca3P2 + 6H2O => 3Ca(OH)2 + 2PH3
3) 2PH3 + 4O2 => P2O5 + 3H2O
Ответ: 321
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P → Ca3P2 → PH3 → P2O5
1) 2P + 3Ca => Ca3P2
2) Ca3P2 + 6H2O => 3Ca(OH)2 + 2PH3
3) 2PH3 + 4O2 => P2O5 + 3H2O
Ответ: 321