Hydrogen gas produced in the laboratory by the reaction of zinc and hydrochloric acid was 23) collected over water at 25°c. the barometric pressure at the time was 742.5 mm hg. what is the pressure of dry hydrogen gas if the vapor pressure of water at 25'c is 23.8 mm hg?
a) 760.0 mm hg
b)718.7 mm hg
c)742.5 mm hg
d) 766.3 mm hg
e) none of the above

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In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.