Question

Number of carbon atoms in 2.5g of HC2H3O2

Answer 1

RMM of $HC_2H_3O_2=1+2\times 12+1\times3+2\times 16=60gm$

Number of moles of $HC_2H_3O_2$ =$2.5/60=0.04167$

Number of carbon atoms in 2.5g of $HC_2H_3O_2$ =$0.04167\times 2\times 6.022\times 10^{23}=5.0187\times 10^{22}$