What happens to the particles during condensation

What does x represent in the formula for the compound xcl4?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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?