Ok, because in exams you will have to learnt to do the actual calculations, so I am going to point you in the right direction and you will have to do the calculations yourself
a) basically, use the formula number of moles=mass/molar mass, so accordingly find molar mass of ethanol-from the periodic table and using calculator, and use the formula to calculate how many moles of ethanol is used in the combustion reaction, than times that value by the heat of combustion and you will get the energy released in kJ.
b)so if one mole of ethanol releases 1364kJ, so when 45kJ divided by 1364kJ/mol, you will get the number of moles of ethanol needed to liberate 45kJ of energy, so essentially 45/1364 moles, (the kJ units cancels out leaving the final answer in moles), and using the formula n=m/M again, you sub the moles, know the molar mass, so just times it to get the mass of ethanol
c)well, refer to your heat released formula, the mcat one, basically, you find out how many moles 0.6g of ethanol make, use the formula n=m/M, you know the mass, know the molar mass, so you get the number of moles, then you times that value by 1364kJ to get the total amount of energy released/transferred to the water, then as 500ml of water is 500g, and the specific heat of water is usually expressed as J/g, so you convert the energy from kJ to J by times it by 1000
so total amount of energy=mass of water times specific heat capacity times change in temperature -as you know the mass of water, the specific heat capacity, and total amount of energy, just use simple division to get the change in temperature-which will be the increase in temperature-you don't need to know what the final and initial temperature to calculate the temperature increase-
If there is anything I've said that confused you, you are welcome to pm me-hope this helps
