water decomposes in an evacuated 2.00L container. If you started with 20.0 grams of water, determine the total resulting pressure of the two product gases if the reaction happens at 25°C.

Resulting pressure is 13.6 atm.

Explanation:

Using Ideal gas equation, we can find the pressure of the gases formed in the reaction.

PV = nRT

Number of moles, n = given mass / molar mass = 20 g / 18 g/mol

= 1.11 moles

Volume, V = 2 L

Temperature, T = 25°C + 273 = 298 K

R = gas constant = 0.08206 L atm K⁻¹ mol⁻¹

P = nRT/V

= 1.11*0.08206 * 298 / 2

= 13.6 atm