Kindly answer the following problem thank you so

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2. Calculate the internal energy change for a process in which: (3 points each) a. a system loses 1150 J of heat to the surroundings and the surroundings do 480 J of work on the system, b. a system absorbs 0.140 kilojoules of heat and does 85 J of work on the surroundings. c. the surroundings absorb 185 J of heat and does 355 J of work. 3. (3 pts each) Calculate the number of: a. moles in 720.0 g of glycerin, CH,O, b. water molecules in 0.0500 g H:0 4. (5 points) How many grams of Ny are required to react with 2.30 moles of Mg? Shown below is an unbalanced reaction. Mg + N + MgNG