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mCaCO3= 40 u + 12 u + 16 u * 3
mCaCO3= 100 u
40 u --------- 100 u
10 g --------- x g
xg = 25 g
odp: W 25 g węglanu wapnia znajduję się 10 g wapnia.
M=100g/mol
M wapnia = 40g/mol
40g------------100g
10g---------------xg
x=25g