How much mass (in gram units) is represented by the following ? (i) 0.2 mol of `NH_3`
(ii) 3.0 mol of `CO_2`
(iii) 5.14 mol of `H_5IO_6`

Explanation

(a) Molar mass of `NH_3=(1xx14+3xx1)=17 g "mol"^(-1)`
Mass of 0.2 mol of `NH_3=0.2 mol xx 17 g "mol"^(-1)`
`=3.4g `
(b) Molar mass of `CO_2=(1xx12+2xx16)= 44 g "mol"^(-1)`
Mol of 3 moles of `CO_2=3 "mol" xx 44g "mol"^(-1)`
`=132 g`
(c) Molar mass of `H_2IO_6 =(5xx1+1xx127+6xx16)=228 g "mol"^(-1)`
Mass of `5.14` mol of `H_2IO_6 =5.14 "mol" xx228 g "mol"^(-1)=1171.9g`.