Question

What is the weight of 1000 wc (water column) of propane?

A) 420 lb
B) 540 lb
C) 650 lb
D) 800 lb

Answer 1

The question deals with the complete combustion of propane in chemistry, requiring the balanced equation, the volume of oxygen needed for combustion, the heat of formation calculation, and the temperature increase of water when a known mass of propane is burned.

Step-by-step explanation:

The question concerns the combustion of propane (C3H8) and the calculations related to it, which is a topic in high school Chemistry. We'll address each part of the provided information:

1. Complete combustion of propane: The balanced chemical equation for the complete combustion of propane is C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l).
2. Oxygen volume for combustion: To calculate the volume of oxygen required to combust propane, we can use the stoichiometry of the reaction, along with the provided information about air composition and the mass of oxygen per liter of air at given conditions.
3. Heat of propane combustion: The heat of formation of propane can be calculated using Hess's law, taking into consideration the given heats of formation for water and carbon dioxide.
4. Temperature increase of water: The increase in temperature of water when 25.0 grams of propane is burnt can be calculated using the heat of combustion of propane and the specific heat capacity of water.