The temperature of 5.00 kg of N₂ gas is raised from 10.0 °C to 130.0 °C. If this is done at constant volume, find the increase in internal energy ΔU. Alternatively, if the same temperature change now occurs at constant pressure determine both ΔV and the external work ΔW done by the gas. For N₂ gas, c_υ = 0.177 cal/g · °C and c_p = 0.248 cal/g · °C.