what would the right answer be
Gold dissolves in the acid mixture known as aqua regia according to the following balanced reaction:
Au + HNO3 + 3 HCl --> AuCl3 + NO + 2H2O
If 1.25mg of gold can dissolve what mass of Hydrochloric acid will also be reacted to completely dissolve this gold.
7.72 X 10-5 g HCl
3.75 mg HCl
6.95 X 10 -4 g HCl
0.6947 g HCl