Molalitas larutan Nacl 10% massa dalam air adalah.....m (Ar Na=23, Cl=35,5 )

wt = 10 gram
wp = 100 - 10 = 90 gram
Mr = 58,5
m = .........................?

m = wt/Mr x 1000/wp
= 10/58,5 x 1000/90
= 1,9 molal