Question

Assuming all volume measurements are made at the same temperature and pressure, how many liters of oxygen gas would it take to react completely with 7.25 liters of hydrogen gas? Show all of the work used to solve this problem.

Unbalanced equation: H2 (g) + O2 (g) -> H2 O(g)

Answer 1

Avogadro's Law states that equal volumes of gas contain equal moles of gas, so we can use the coefficients of a balanced reaction to apply to LITERS of gas as well as MOLES, provided that the other conditions (P, and T) are also constant between the 2 gases.

First things first, balance the reaction.

Use the mole ratio of the balanced reaction to determine the liters of O2 from liters of H2. I get about 3.625L of O2 gas.

Answer 2

yes..equal volume of all gas under same condition of T and P contains same no of molecules....So balancing the eqn..2H2+O2-->2H2O
ie, 7.25L H2+7.25/2 L O2 --> 7.25L H2O.
So O2 = 3.625L...