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[[ a nie V?]]
2P +5O2 -> 2P2O5
x 177,5g
masa fosforu -31g/mol
masa tlenu -16g/mol
masa P2O5- 142g/mol
62g-142g x=62*177,5/142=77.5g
xg-177,5g
odp: 77,5g fosforu uległo spaleniu