What is the atomic mass of an atom that contains 21 protons, 21 electrons, and 25 neutrons

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

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?

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration