Earth goes once around the Sun every 365.25 days. What is the ratio of the days in the Moon's synodic
period to the number of days in Earth's sidereal orbital period?

given information:

2c6h14 + 19o2 → 12co2 + 14h2o

moles of co2 produced = 18.4

to determine:

moles of c6h14 required to produce 18.4 moles of co2

explanation:

based on the combustion reaction stoichiometry:

2 moles of c6h12 burns to produce 12 moles of co2

i.e.

6 moles of co2 are produced by burning 1 mole of c6h12

thus, 18.4 moles of co2 would require: 18.4 co2 * 1 c6h12/6 co2 = 3.07 moles of c6h12

ans: (b)