I got something like 55.1J for the q=mcAT question but I don't know if its right (that number might not be exactly what I got but it's what I remember)
That's what I got as well, I thought it looked wrong when I did it but I double checked and got the same answer.
Its Rb because in group 1 (alkali metals), the Boiling point and Melting Point decrease as you go down. Rb was the last Alkali Metal so its the lowest Boiling Melting/Point.
Rubidium is a liquid at room temperature but fluorine is a gas.
On the specific heat capacity question I think I got an answer of around 55.104? Didn't you have to do 0.8 x 4.2 x (38.4-22.0) since that was the temperature change?
0.8g was the mass of the ethanol burnt but that was not needed in the question you needed to use the 50g of water. You'll probably still get 1 or 2 marks.