a) A brass rod is 70 em long at 40 C, and it has a mass of 300 g. During a heating process, the rod absorbs a net thermal energy of 1150 J. Find the increase in length of the rod. You may make use of the data provided in Table Q2(a). [3 marks ] Substance Specific Heat, c Linear thermal Thermal Jkg '(C)-1 expansion conductivity, k coefficient, a Wm-(C)- Brass 380 19x10-6 109.0 Table Q2(a) b) A vessel of volume 30 liters contains 2.5 moles of gas at 30.0 C. 1) Determine the gas pressure. 11 If the gas is neon, determine the mass (in kg) of the gas in the vessel. Given: relative atomic mass of neon = 40 and 1 L = 1 x 10-3 m3. [2 marks]