The Coefficient of H₂ After Balancing the Equation Is _____

The coefficient of H₂ after balancing the equation is _____.

A) 1
B) 5
C) 3
D) 2
E) 4
Refer to the reaction below for 52-54.
Given:
Au⁺ → Au + Au³⁺ (Hint: both half reactions will start with the same reactant.)