Find the empirical formula for a compound made with 41.4% carbon, 3.45% hydrogen, and 55.2% oxygen

Can someone me with these questions plz.

Volume is a measurement of how fast particles of a substance are moving

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.