Berapa fraksi 10% berat larutan HNO3 dalam air?

10%=10gr larutan HNO3 (Mr=63)
90%=90gr pelarur air (Mr=18)

Xt= Nt/Nt+Np
Nt=mol terlarut(HNO3)
Np=mol pelarut(Air)

Nt=10/63=0.15
Np=90/18=5

Xt=0.15/0.15+5
= 0.15/5.15
=0.03