Please help me I need the answer and it’s due almost due I can’t fail

Suppose you got a low yield of benzoin from your benzoin condensation reaction and thus only have 0.300 g of benzoin to use as the starting material for this reaction. how much concentrated nitric acid should you add? (concentrated nitric acid is 15.8 m). write your answer in the form x.xx ml

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

At element makes up all organic compounds?