# Problem: Propane, C3H8, is a hydrocarbon that is commonly used as a fuel.Calculate the volume of air at 25°C and 1.00 atmosphere that is needed to completely combust 25.0 grams of propane. Assume that air is 21.0 percent O2 by volume. (Hint: we will see how to do this calculation in a later chapter on gases—for now use the information that 1.00 L of air at 25°C and 1.00 atm contains 0.275 g of O2 per liter.)

###### FREE Expert Solution
• Start by writing the balanced combustion reaction of propane.
• From the mass of propane, we can use the balanced equation to get the moles  of Oby stoichiometry
• Moles of Owill be plugged into an ideal gas equation to find V of O2
• V of air will be calculated from V of O2 using the information where 21% of air is made up of O2
###### Problem Details

Propane, C3H8, is a hydrocarbon that is commonly used as a fuel.

Calculate the volume of air at 25°C and 1.00 atmosphere that is needed to completely combust 25.0 grams of propane. Assume that air is 21.0 percent O2 by volume. (Hint: we will see how to do this calculation in a later chapter on gases—for now use the information that 1.00 L of air at 25°C and 1.00 atm contains 0.275 g of O2 per liter.)