What is the relationship between enthalpies p, q, r and s?
S(s) + H2(g) -> H2S(g) AH=p
H2(g) + 2O2(g) -> H2O(1) AH=q
S(s) + O2(g) -> SO2(g) AH=r
H2S(g) + 1%O2(g) -> H2O(l) + SO2(g) AH=s

What must happen before a body cell can begin mitotic cell division

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Which factor is likely to impact the possible number of compounds ?