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HCl
Cm = 0,7mol/dm3
n = 5,4 mola
Cm = n/V
V = n/Cm
V = 5,4mola/0,7mol/dm3 = 7,7 dm3
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zadanie 2
2HgO -> 2Hg + O2
MHgO = 217g/mol
1 mol - 217g
x - 6,5g
x = 0,03
2moleHgO - 1 molO2
0,03 mola - x
x = 0,015
1 mol - 22,4 dm3
0,015 mola - x
x = 0,336 dm3 O2
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zadanie 3
2NaOH + H2SO4 -> Na2SO4 + 2H2O
1 molNaOH - 40g
x - 50g
x = 1,25
1 mol H2SO4 - 98g
x - 20g
x = 0,2
2 mole NaOH - 1 mol Na2SO4
1,25 mola - x
x = 0,625 mola
MNa2SO4 = 119g/mol
1 mol - 119g
0,625 mola - x
x = 74,375g
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zadanie 4
Mr = 32 g + 8g = 40g
Ms = 8 g
C% = Mm/Mr * 100%
C% - 8g/40g * 100% = 20%
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zadanie 5
Mr1 = 150g
C%1 = 8%
Mr2 = 50g
C%2 = 12 %
8% = ms/200g * 100%
ms = 16 g
12% = ms/200g * 100%
ms = 24 g
24 g + 16 g = 40g
C% = 40g/200g * 100%
C% = 20%