# What is the value of ΔH for the combustion of one mole of propane?

Contents

The standard enthalpy change for the combustion of 1 mole of propane is –2043.0 kJ.

## What is the ΔH for the combustion of propane C3H8 at standard conditions?

The heat of combustion of propane, C3H8, as described in the equation C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l), is –2220 kJ mol-1 and the heats of formation of carbon dioxide gas and water liquid are –393.5 kJ mol-1 and -285.8 kJ mol-1 respectively.

## What is the value of ΔH for the combustion of one mole of methane?

The combustion of methane, CH4, releases 890.4 kJ/mol. That is, when one mole of methane is burned, 890.4 kJ are given off to the surroundings. This means that the products have 890.4 kJ less than the reactants.

## What is the complete combustion of propane?

The ideal combustion ration (“complete combustion”) for propane is 1 part propane (4%) to 24 parts of air (96%). Even at this ideal ration, combustion products, known as flue gases, still occur. However, under this scenario, those products are harmless carbon dioxide and water.

## How do you calculate the combustion of propane?

The balanced chemical equation for the combustion of propane is: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).

IMPORTANT TO KNOW:  How was propane discovered?

## How many moles of propane are burned?

The molar mass of propane is 44 g/mole, so burning propane will release (2030kJ/mole) / (44g/mole) = about 46 kJ/g of fuel burned.

ANSWERS TO HOMEWORK #1 – THE WHOLE THING.

CH4 C3H8
kJ released per gram of fuel used 51 46

## How much energy is released when 0.2 mol of propane are burnt?

The energy released = (-2220 KJ/mol x 0.2 mol) / (1.0 mol) = -444.0 KJ/mol.

## Which is the net energy released on complete combustion of propane?

Which is the net energy released on complete combustion of propane? –2024 kJ/mol.

## How do you calculate delta H?

Subtract the sum of the heats of formation of the reactants from that of the products to determine delta H: delta H = –110.53 kJ/mol – (–285.83 kJ/mol) = 175.3 kJ. 