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2P+5S--->P2S5
xg 0,5g
62g--222g
xg--0,5g
x=62g*0,5g/222g
x=0,14g
2*40g 2*56g
2Ca+O2--->2CaO
1g xg
80g---112g
1g---xg
x=112g*1g/80g
x=1,4g
4g 32g
2H2+O2--->2H2O
xg 4g
4g---32g
xg---4g
x=4g*4g/32g
x=0,5g
207g 2*18g
PbO2+2H2--->Pb+2H2O
xg 3g
207g---36g
xg---3g
x=207g*3g/36g
x=17,25g