Water can be formed according to the equation: #2H_2 + O_2 -> 2H_20#. If 8.0 L of hydrogen is reacted at STP, exactly how many liters of oxygen at STP would be need to allow complete reaction?

1 Answer
anor277
May 28, 2016

#4.0*L# of dioxygen gas are required.

#2H_2(g) + O_2(g) rarr 2H_2O(l)#

Explanation:

Avogadro's gas law holds that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules (i.e. #Vpropn)#. It follows that different volumes of gases under equivalent conditions contain numbers of molecules proportional to their respective volumes.

Given #8.0*L# dihydrogen gas, #4.0*L# dioxygen gas are required; i.e. the respective gas volumes follow the stoichiometry of the equation.

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