can someone help me with chemistry?

4. a) The hydrogenation of acetylene to form ethane is shown below. C2H2(g) + 2H2(g) - CH.(g) Suppose 30 kmol/h of C, H, and 50 kmol/h of H, are fed to a reactor. 1) What is the stoichiometry ratio of H, OCH? (1 Marks) ) What is the ratio of H, to C2H2 in feed? (1 Marks) II) What is the limiting reactant? (2 Marks) IV) What is the chemical that has fractional excess for this reaction and what will be the value? (2 Marks) b) Bromine is the third-lightest halogen and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. A Bromine atom is measured to have a diameter of 230 ppm. Give your answer in m (Given im = 1 x 10 pm) 1) Determine the volume of bromine. (2 Marks) ii) Calculate the surface area of bromine (2 Marks) [Total : 10 Marks]