# What is the total number of moles of NaCl formed when 2 moles of Na_2CrO_4 react completely?

As the formula of $N {a}_{2} C r {O}_{4}$shows that 1 molecule contains 2 atoms of Na then 2 molecules will contain 4 atoms of Na i.e. 1 mole contains 2 moles Na..Again 1 mole NaCl contains 1 mole Na
This means 2moles of $N {a}_{2} C r {O}_{4}$ will form 4 moles NaCl