Kemolalan larutan NaCl 10% massa dalam air adalah.......m.(Mr NaCl=58,51)

wt = 10 gram
Mr = 58,51 gr/mol
wp = 90 gram
m = ...................?

m = wt/Mr x 1000/wp
= 10/58,51 x 1000/90
= 0,17 x 11,11
= 1,89 molal