Calculate the molality of a solution that is made up of 250 g of water and 20.0 g of NaOH.

Question

Phoebe Aguirre

Chemistry

27 January, 04:47

Calculate the molality of a solution that is made up of 250 g of water and 20.0 g of NaOH.

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Answers (1)

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Mina Hart · Answer 1

M (H₂O) = 250 g=0.250 kg

m (NaOH) = 20.0 g

M (NaOH) = 40.0 g/mol

n (NaOH) = m (NaOH) / M (NaOH)

Cm=n (NaOH) / m (H₂O)

Cm=m (NaOH) / {M (NaOH) m (H₂O) }

Cm = 20.0/{40.0*0.250}=2 mol/kg