Paul was looking at the sample of Neon isotopes below. He calculated average atomic mass by doing the following: 20 + 21 + 22 = 63 / 3 = 21 amu
Paul is told that his answer is incorrect but doesn't know why. Explain what's wrong with his calculation & answer

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

All motion is caused by force? true or false

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?