How many grams of oxygen are produced when 36.6 g of NO2 is formed?
2 Pb(NO3)2(s) --> 2 Pb(s) + 4 NO2(g) + 1 O2(g)

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?