When copper reacts with silver nitrate solution, solid silver is formed.
Two possible equations for this reaction are
A Cu+AgNO3→Ag+CuNO3\text{Cu} + \text{AgNO}_3 \rightarrow \text{Ag} + \text{CuNO}_3Cu+AgNO3→Ag+CuNO3
B Cu+2AgNO3→2Ag+Cu(NO3)2\text{Cu} + 2\text{AgNO}_3 \rightarrow 2\text{Ag} + \text{Cu}(\text{NO}_3)_2Cu+2AgNO3→2Ag+Cu(NO3)2
It was found that 6.35 g of copper powder reacted with excess silver nitrate solution to produce 21.60 g of silver.
Carry out a calculation to decide which equation, A or B, represents the reaction taking place. (Relative atomic masses: Cu=63.5\text{Cu} = 63.5Cu=63.5, Ag=108\text{Ag} = 108Ag=108)
