Determine how many grams are in 1.55x10^22 formulas units of lithium phosphate?

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?

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

If a particle has z = 25 and 23 electrons, what is its charge?