To calculate the percent yield, we need to know the theoretical yield and the actual yield. The theoretical yield is the amount of product that would be produced if the reaction went to completion, while the actual yield is the amount of product that is actually produced.

The percent yield is calculated using the following formula:

```

% yield = (actual yield / theoretical yield) x 100

```

In this case, the actual yield is 14.4 and the theoretical yield is not provided. Therefore, we cannot calculate the percent yield.

If you have the theoretical yield, you can plug it into the formula above to calculate the percent yield.