Question

Jika 150 ml air H2SO4 , 10 molar mempunyai massa jenis larutan 1,2 gr/ml. tentukan fraksi mol H2SO4 .!

terima kasih.

Answer 1

massa 150 mL = 150 x 1.2 = 180 gram 
m = (w/Mr)(1000/P) 
10 = (w/(2 + 32 + 4 x 16))(1000/(180 - w)) 
w = 89.09 g

Fraksi mol H2SO4 adalah, 
X = (w/Mr)/(w/Mr + w'/Mr') 
X = (89.09/98)/(89.09/98 + (180 - 89.09)/18) 
X = 15.25%