Theoretical mass of copper (II) nitrate formed from copper metal. The mass is of Cu is 0.503g

Answer 1

First, we should write the correctly balanced equation for the reaction taking place...

Cu(s) + 2HNO₃ ==> Cu(NO₃)₂ + H₂(g)

0.503g....xs.............? g................

moles Cu present = 0.503 g x 1 mol Cu/63.5 g = 0.007921 moles Cu

moles of Cu(NO3)2 formed = 0.007921 mol Cu x 1 mol Cu(NO3)2 / mol Cu = 0.007921 mol Cu(NO3)2 formed

theoretical mass of Cu(NO3)2 = 0.007921 mol x 187.6 g/mol = 1.47 g (3 sig. figs.)