If there are 14 coins in total and Hong has put them into 2 stacks with the same number of coins in each stack, we can find the number of coins in each stack by dividing the total number of coins by the number of stacks.
So, we calculate:
\[ \text{Number of coins in each stack} = \frac{\text{Total coins}}{\text{Number of stacks}} = \frac{14}{2} = 7 \]
Therefore, each stack has 7 coins.