500 G of Hydrogen Gas and 50

5.00 g of hydrogen gas and 50.0 g of oxygen gas are introduced into an otherwise empty 9.00 L steel cylinder, and the hydrogen is ignited by an electric spark. If the reaction product is gaseous water and the temperature of the cylinder is maintained at 35ºC, what is the final gas pressure inside the cylinder

A) 0.92 atm
B) 2.58 atm
C) 6.96 atm
D) 7.86 atm
E) 18.3 atm