Balance the equation

What is the temperature of one mole of helium gas 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?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)