If a 38 g sample of water releases 1621 J of heat energy and cools from 307 K. What is final temperature of water?

What is the mass of 4 molecules of co2

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

How many neutrons does an element have if its atomic number is 50 and its mass number is 166