Question

Consider the reaction, 3 cu + 8 hno3 => 3 cu(no3)2 + 2 no + 4 h2o. how many moles of h2o will be made from 98.6 grams of cu? give your answer to one decimal place.

Answer 1

n(Cu)=m(Cu)/M(Cu)

n(H₂O)=4n(Cu)/3

n(H₂O)=4m(Cu)/{3M(Cu)}

n(H₂O)=4*98.6g/{3*63.5g/mol}=2.0703≈2.1 mol

n(H₂O)=2.1 mol