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I am confused, if there is a Q where they give a velocity formula (eg: V= 1/2t + sin(1/2t)) and they ask you to find the total distance travelled (say between t=0 and t=2), given that V is always > 0, can you get this by finding the area under the Velocity graph between 0 and 2 or does this not...

Yes, Oleum is sufficient for a single mark and is preferred for the HSC

For Question 2, how can u calculate the pH if you don' tknow the equalibrium constant? it is impossible to calculate the pH without knowing the amount of mols oh H+ ions in solution and without the K value the concentration of H+ cannot be calculated as the acid is weak (not completely ionised)...