Please help #1, #2, #3 I do not understand how to do them

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0