Answer to Question #314012 in General Chemistry for Roya

Question

How many joules are released when 2.4 g H₂O at 0.0^oC solidify? (Specific Heat = 4.2 J/g^oC, Enthalpy of fusion = 6010 J/mol, Enthalpy of vaporization = 40700 J/mol)

how did you got 25?

Answer 1

n = m / M

M (H₂O) = 18 g/mol

n (H₂O) = 2.4 / 18 = 0.13 mol

Q (H₂O) = 6010 x 0.13 = 781.3 J