Asample of hydrogen gas was collected over water at 21 c and at a pressure equal to the atmospheric pressure of 748 mmhg. the volume of the sample was 512 ml. how many grams of h2 are in the sample? the vapor pressure of water at 21 c is 18.7 mmhg

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.