How many moles are in 3.09*10^24 atoms of sodium

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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?

Which substance can be broken down by chemical means