Ile moli ma jedna szklanka 250ml
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masa molowa H2O=2*1+1*16=18g/mol
gęstość H2O=1g/cm3
1cm3=1ml
więc:
250 ml=250cm3=250g
18g H20-----1 mol
250g H20-----xmoli
x=250/18
x=13,88 mola