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mP=31u
mP₂S₅=222u
2P + 5S ---> P₂S₅
2*31g fosforu ----- 222g P₂S₅
xg fosforu -------- 0,5g P₂S₅
x = 0,16g fosforu
2)
mCa=40u
mCaO=56u
2Ca + O₂ ---> 2CaO
2*40g Ca ------ 2*56g CaO
1g Ca --------- xg CaO
x = 1,4g CaO
3)
mH₂=2u
mO₂=32u
2H₂ + O₂ ---> 2H₂O
4g wodoru ------ 32g tlenu
xg wodoru ------- 4g tlenu
x = 0,5g wodoru
4)
mPb=207u
mH₂O=18u
PbO₂ + 2H₂ ---> Pb + 2H₂O
207g Pb ------ 2*18g wody
xg Pb --------- 3g wody
x = 17,25g Pb
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