chem. problem dealing with rate?

Question

The average rate of disappearance of ozone in the atmosphere in the reation 203 (g)--------> 3O2 (g) is found to be 9.00 x 10^-3 atm over a certain interval of time. What is the rate of appearance of O2 during this interval?

Answer 1

1.5 x 9 x 10-3

(the 1.5 comes from the mole ratio 3/2)

Answer 2

OK this is a very simple pH question- your equation is- HCHO2 + H2O --> H30 + CHO2- Ka = ( [H3O] * [CHO2-] ) / [HCHO2] 1.8x10^-4 = x^2 / 0.25 x = 6.71x 10^-3 M So now you've found the concentration of your H3O and this represents how many H+ molecules are in your solution. To find the pH you do pH = -log[H] so pH= -log [6.71x10^-3] pH = 2.17