Question

C3H8+ 5O2 -> 3CO2+ 4H2O
How many moles of oxygen are necessary to react completely with four moles of propane

Answer 1

Answer:

20 moles

Explanation:

we are given the equation, propane is C3H8. I'll put 1 in front of C3H8 to show you the ratios. The right side of the equation is not needed.

1C3H8+ 5O2

1 : 5

4 moles : x moles

working out x:

to get from 1 to 4 in C3H8 multiply by 4, so do the same to the other side for O2

5 × 4 = 20, so 20 moles are necessary to react completely with four moles of propane