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Wrife your answer on a blank sheer of paper, you wust show all vour caleulation work clearly to get full marks. Pentaborane, B5H9 is a liquid that will burn spontaneously when it comes into coatact with oxygen. The equation for this reaction is: 2B5H9(L)+12O2(g)5B2O3(s)+9H2O(I)AH=7kJ Use the following thermochemical data and Hess" law of Summation to calculate the enthalpy change for the above reaction. ( 4 marks) 5B(s)+4H/H2(g)B3H9(l)4B(s)+3O2(g)2B2O3(s)H2(g)+1/2O2(g)H2O(l)H=+73.2kJH=2546.4kJH=285.8kJ Wrire vour answer on a blank sheet of paper, you must show all your calculation work clearly to gat full marks: Acetone (C3H6O) is a component of nail polish remover and is a flammable liquid where it undergoes combustion according to the following equation: C3H6O(l)+4O2(g)3CO2(g)+3H2O(l)+1790.3kJ a. Use the balance equation, together with the standard heats of formation from the data booklet to calculate the standard heat of formation of acetone (in kJ/mol ). ( 2 marks) b. Calculate the mass of acetone (in grams) required to react with excess oxygen gas to produce 9500 kJ of energy from this combustion reaction. (2 marks)