Question

Determine the mass of N2H4 obtained from 140 g of N2, according to the reaction: N2 + 2 H2 → N2H4.

Data: H-1, N-14.

Answer 1

mass of $N_2H_4=?$

mass of $N_2=140g$

number of moles of nitrogen$=\frac{140}{2\times14}=5moles$

mole ratio is $1:1$

number of moles of $N_2H_4=5moles$

mass of $N_2H_4=5(2\times14+1\times4)=5\times32=160g$