Calculate the Change in Internal Energy When 2

Calculate the change in internal energy when 2.50 kJ of energy is transferred as heat to 1.50 mol BF₃ at 298 K and 1 atm at constant volume.

A) +1.00 kJ
B) +2.50 kJ
C) -1.50 kJ
D) -2.50 kJ
E) +1.50 kJ