A technician produced H_2 gas by reacting zinc (Zn) with sulfuric acid (H_2SO_4).The reaction was : 2Zn (s) + H_2SO_4 (aq). —>Zn_2SO_4 (aq) + H_2. He collected the hydrogen in a flask by water displacement. Atmospheric pressure was 737.2 torr and room temperature was 25.0^degree . What was the pressure of H_2 in the flask?

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

c, liquids evaporate, creating a gas