How many grams of oxygen are required to completely burn 5.90 grams of C₃H₈ in the following unbalanced equation?
C₃H₈(g) + O₂(g) → CO₂(g) + H₂O(g)
A. 5.90 grams
B. 21.4 grams
C. 4.28 grams
D. 10.7 grams
E. 29.5 grams