Chromium is more reactive than silver.
Chromium reacts with silver nitrate solution to form solid silver.
Two possible balanced equations for the reaction are
Equation 1: Cr+2AgNO3→Cr(NO3)2+2Ag\text{Cr} + 2\text{AgNO}_3 \rightarrow \text{Cr}(\text{NO}_3)_2 + 2\text{Ag}Cr+2AgNO3→Cr(NO3)2+2Ag
Equation 2: Cr+3AgNO3→Cr(NO3)3+3Ag\text{Cr} + 3\text{AgNO}_3 \rightarrow \text{Cr}(\text{NO}_3)_3 + 3\text{Ag}Cr+3AgNO3→Cr(NO3)3+3Ag
In one experiment, it was found that 1.56 g of chromium reacted with excess silver nitrate solution to form 9.72 g of silver.
Carry out a calculation, using the information above, to show which equation represents the reaction taking place. (Relative atomic masses, ArA_rAr: Cr=52\text{Cr} = 52Cr=52, Ag=108\text{Ag} = 108Ag=108)
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.