Question

Selling for a reactating a chemical equation e is one is). When one buted cally theygen (0) to production de (CO A major component HO What m e an consumed by the reaction of anyon Dere you w as the correct number of contagit

Answer 1

Answer:

Step 1: Explanation:

A mole ratio is ​the ratio between the amounts in moles of any two compounds involved in a chemical reaction. The mole ratio can be determined by examining the coefficients in front of formulas in a balanced chemical equation.

Step 2: calculate the moles of oxygen gas

we know, moles = mass given / molar mass

Moles of Oxygen gas = ( 7.92 g / 32 g/mol ) = 0.2475 mol

Step 3:   write the balanced chemical equation.

2 C₈H₁₈(l) + 25O₂(g) ---> 16CO₂(g) +18H₂O(g)

Step 4:   Calculate the moles of octane needed

2 C₈H₁₈ + 25O₂---> 16CO₂ +18H₂O

According to the reaction:
25 mol of O₂ completely reacts with 2 mol of  C₈H₁₈

So, 0.2475  mol of O₂ will completely react with = (2 mol of C₈H₁₈ / 25 mol of O₂ )× 0.2475 mol of O₂ = 0.0198 mol of C₈H₁₈

Hence , Moles of C₈H₁₈ needed = 0.0198 mol

Step 5 : Calculate the mass of octane required

We know Mass = moles × molar mass of octane = 0.0198 mol × 114.23 g/mol = 2.26 g

hence, mass of octane is consumed = 2.26 g