Question

I am having issues trying to understand these questions... Here are a few of them, if you could help me in any way I would appreciate it so much!!!

1) Find ΔH∘f for NO2(g) from Appendix IIB in the textbook.
2) Find ΔH∘f for MgCO3(s) from Appendix IIB in the textbook.
3) Find ΔH∘f for C2H4(g) from Appendix IIB in the textbook.
4) Find ΔH∘f for CH3OH(l) from Appendix IIB in the textbook.