Calculate the number of moles represented by 3.11×10^24 molecules of NO2.

i need help ASAP !

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

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?