How many moles of O2 gas are used to produced 0.75 moles of CO2 @ STP ?

Question

C3H8+5O2=3CO2+H2O

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Answer 1

the balanced chemical equation tells you that the mole ratio here is 5 mol O₂ for every 3 mol CO₂ produced, meaning that to find the number of mole of O₂ required you can take

0.75 mol CO₂ x (5 mol O2 / 3 mol CO₂) = 1.25 mol O₂

1.25 moles of O₂ gas are needed to produce 0.75 moles of CO₂

Answer 2

You can easily reach out if you have any more questions.

1. Step 1. Find the mole-to-mole ratio between CO₂ and O₂

From the chemical reaction I see that there are 5 O₂/3 CO₂

1. Step 2. Calculate moles

moles of O₂= 0.75 mol of CO₂* 5 mol of O₂/3 mol of CO₂ = 1.25 mol of O₂

Also, you chemical reaction is not balanced fully: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

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