Question

2C2H2(g) 5O2(g) → 4CO2(g) 2H2O(g) This is a balanced equation for the combustion of acetylene (C2H2). How many moles of oxygen(O2) are required to react completely with 1. 0 mole of acetylene?.

Answer 1

The moles of oxygen required to completely react with 1 moles of acetylene is 2.5 mol.

The balanced chemical equation for the reaction is given as:

$\rm 2\;C_2H_2\;+\;5\;O_2\;\rightarrow\;4\;CO_2\;+\;2\;H_2O$

Computation for moles of Oxygen required

The stoichiometric coefficient in the balanced chemical equation gives the information for the moles of products and reactants in the reaction.

From the given balanced chemical equation, for reacting with 1 mole of acetylene, 5 moles of oxygen is required.

The moles of oxygen required to react with 1 mole of acetylene are:

$\rm 2\;mol\;C_2H_2=5\;mol\;O_2\\\\1\;mol\;C_2H_2=\dfrac{5}{2}\;\times\;1\;mol\;O_2\\\\ 1\;mol\;C_2H_2=2.5\;mol\;O_2$

The moles of oxygen required to completely react with 1 moles of acetylene is 2.5 mol.

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