A balloon is filled with helium gas at 20.0 degrees C and 1.0 atm pressure (1 atm = 1.01 x 10^5 N/m^2). The volume of the balloon after filling is measured to be 8.50 m^3. The helium is then heated until its temperature is 55.0 degrees C. During this process the balloon expands at constant pressure. What is the heat gained or lost by the helium? (Assume the helium is an ideal gas)