To solve chemistry questions

Question

1. How many moles of propane would be required to produce 540g of carbon dioxide?

C₃H₈ (g) + 5O₂ (g)

⟶⟶

⟶⟶  3CO₂ (g)+ 4H₂O (l)The molar masses of C, H and O are 12, 1, and 16 g/mol respectively

Group of answer choices

4.1 mol

12.3 mol

Answer 1

C₃H₈ + 5O₂ ==> 3CO₂ + 4H₂O ... balanced equation

We see from the balanced equation the it takes ONE MOLE of propane to produce THREE MOLES CO₂.

So, we simply find out how many moles of CO₂ we have 540 g and convert to moles of propane using this ratio of 1:3.

moles CO₂ = 540 g CO₂ x 1 mol CO₂/44 g = 12.27 moles CO₂

12.27 moles CO₂ x 1 mol propane / 3 moles CO₂ = 4.09 moles propane needed

So, answer would be 4.1 mol