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ms = mr*cp/100%
ms = 2000g*40%/100% = 800g
Na₂SO₄ · 10H₂O
2*23g/mol +32g/mol + 4*16g/mol + 10(2*1g/mol + 16g/mol)
142g/mol + 180g/mol = 322g/mol
142g-------------322g
800g----------------x
X= 800g*322g/142g = 1814,08g
Rozpuszczono 1814,08g hydratu.
Zad.2
ms = mr*cp/100%
ms = 200g*80%/100% = 160g
mr = 200g + 200g = 400g
cp = 160g*100%/400g = 40%
M(H₂SO₄) = 2*1g/mol + 32g/mol + 4*16g/mol = 98g/mol
n = 160g/98g/mol =1,63mola
Vr = mr/d = 400g/0,9g/cm³ =444,44cm³ = 0,444dm³
Cmol = n/V = 1,63mola/0,444dm³ = 3,67mol/dm³