Question

calculate the number of moles in 17gram of H2O

Answer 1

Given mass=17
molar mass 2*1+2*16=34
no.of moles 17/34=0.5mole

Answer 2

Molar mass of H20 = 2x1 +1x16 = 18g

Number of moles = Given Mass / Molar Mass

Number of moles = 17g/18g

Number of moles = 0.94