Question

$2HCl+{Na}_2{S}_2{O}_x\to yNaCl+S{O}_2+S+H_{2}O$
Find the value of x and y.

• A. $x=3,y=2$
• B. $x=2,y=2$
• C. $x=1,y=2$
• D. $x=3,y=1$

Answer 1

The correct option is A $x=3,y=2$

The balanced reaction is:

$2HCl+{Na}_2{S}_2{O}_3\to 2NaCl+S{O}_2+S+H_{2}O$

On the reactant side, there are 2 Na atoms and 2 Cl atoms, so on the product side, there must be 2 $NaCl$ molecules.

On the product side, there are 3 oxygen atoms so on the reactant side, there must be 3 oxygen atoms.

Hence $x=3$ and $y=2$.