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1.Calculeaza in cati moli sunt cuprinsi 144 g de apa
2.Calculeaza masa de dioxid de carbon din 0,5 moli
3.Cate molecule exista in 36 g apa
4.Calculeaza masa de metan in care se gasesc 18.069 x 10 la puterea 23 molecule


Răspuns :

1.
masa molara apa= 18g/mol
1 mol.......18 g apa
x moli......144 g apa
x = 144/18= 8 moli

2.
masa molara CO2= 44g/mol
1 mol...........44g CO2
0.5 moli.......y g CO2
y= 0.5 * 44= 22 g CO2

3.

masa molara apa= 18g/mol
1 mol........18g
x...........36
x= 2 moli apa

1 mol......6.023 * 10^23 molecule
2 moli.......y
y= 12,046 *10^23 molecule apa

4.
1 mol......6.023 * 10^23 molecule
z moli.......18,069 x10^23
z= 3 moli metan
masa molara metan= 16g/mol
1 mol.........16g metan
3 moli........x
x=48 g metan