How the mass of hydrogen is conserved during cellular respiration

How many atoms are in 1.4 mil of phosphorus trifluoride (pf3)

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.