The vapor pressure of pure n-propyl chloride is 347 torr and that of pure n-propyl bromide is 133 torr. A solution is made by mixing 89 g of n-propyl choride (C3H7Cl) and 79 g of n-propyl bromide (C3H7Br). Assume the solution is ideal. What is the total vapor pressure of the solution at 25C?