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6,02*10^23 cz. - 1 mol
3,01*10^21 - x
x = (3,01*10^21*1): 6,02*10^23 = 0,005 mol
b) 10g węglanu wapnia (CaCO3)
m = 10 g
M = 40 + 12 + 48 = 100g/mol
n = m:M
n=10:100=0,1 mol
c) 5,6 dm^3 wodoru (H2)
1 mol - 22,4 dm^3
x mol - 5,6 dm^3
x= 5,6: 22,4=0,25 mol