The combustion of hydrogen and oxygen is commonly used to power rocket
engines:
2H2 (g) + O2 (g) → 2H20 (g)
If the final pressure of water vapor was 0.875 atm and the temperature is 400. K,
how many mols of H20 was produced assuming that the reaction went to
completion in a 250. L engine?
mols
Round your answer to three significant figures. Do not include units in your answer.
Enter the answer

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.