Which of the following correctly gives the best coefficients for the reaction below? Zn + HCl → ZnCl2 + H2

2, 4, 2, 4

1, 2, 1, 4

1, 2, 1, 1

2, 1, 1 ,1

1, 1, 2, 1

Thank you for the help in advance.

This is an unbalanced equation.

: Let’s balance the equation by multiplying HCl on the reactant side by 2.

image

The balanced equation is

Zn + 2HCl → ZnCl2+ H2

∴ Number of atoms of each element of reactants = Number of atoms of each element of products