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5H₂O ma mase 10*1+5*16 = 10+80 = 90u to ma wieksza mase
2CO₂ = 2*12+4*16=24+64=88u
1b
2Cu₂S ma mase 4*64+2*32 = 256+64=320u wiec to ma wieksza mase
3Al₂O₃ =6*27+6*16 = 162+96 = 258u
2a
SiOx - 60u
Si-28u
O - 16u
(60-28):16 = 32:16 = 2 wiec SiO₂
2b
PxO₅ - 142 u
P-31u
O-16u
(142-5*16):31 = 62:31 = 2
P₂O₅