Question

Mau nanya dong yang nomor 4

Answer 1

0,5 molal urea
Urea = 0,5 mol = 0,5 x 60 = 30 gram
air = 1 kg = 1000 gt = 1000/18 = 55,56 mol

a. % urea
    

b. Fraksi mol Urea
    

c. Kemolaran urea
    massa  total larutan = 30 + 1000 = 1030 gram
    Volum larutan = 1030/1,2 = 858,33 mL
    Jadi: