Question

What coefficient of h+ balances the atoms in this half-reaction h+ + mno2 → mn2+ + h2o?

Answer 1

The answer is 4 im pretty sure 

Answer 2

Answer : The coefficient of $H^+$ is, 4

Explanation :

Balanced chemical reaction : It is defined as the chemical reaction in which the number of individual atoms of an element in reactant side always be equal to the number of individual atoms of an element in product side.

The given balanced half-reaction will be,

$4H^++MnO_2\rightarrow Mn^{2+}+2H_2O$

From the balanced half-reaction we conclude that the coefficient of $H^+$, $MnO_2$, $Mn^{2+}$ and $H_2O$ are, 4, 1, 1, 2 respectively.

Therefore, the coefficient of $H^+$ is, 4