Answer:
8
Step-by-step explanation:
beacuse use the molar ratio of ch4 : O2 which is 1:2 so you times 4 by 2
8 moles
in the equation 1 mole of methane is reacting with 2 mole of oxygen
if 1 mole is reacting with 2 moles
so 4 mole will react with 2×4 = 8 moles
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