If we approximate the atmosphere to be 79% nitrogen (n2) and 21% oxygen (o2) by volume, calculate the density of air (kg/m3) at stp conditions (0oc, 1 atm). hint: 1 mole of gas occupies 22.414 l at stp.

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?