How much heat is evolved when 5.00g of propane C3H8 burns completely.

I got the formula down, now what?

C3H8 + 5O2 -> 3CO2 + 4H2O

To calculate the heat evolved during the combustion of propane (C3H8), you need to use the concept of the enthalpy of combustion. The enthalpy of combustion represents the heat released when one mole of a substance undergoes complete combustion.

Here are the steps to calculate the heat evolved:

1. Determine the molar mass of propane (C3H8):
The molar mass of carbon (C) is 12.01 g/mol, and the molar mass of hydrogen (H) is 1.01 g/mol. Since there are three atoms of carbon and eight atoms of hydrogen in propane, the molar mass of propane (C3H8) can be calculated as:
(3 * 12.01 g/mol) + (8 * 1.01 g/mol) = 44.11 g/mol

2. Convert the mass of propane (C3H8) to moles:
Given that 5.00 g of propane (C3H8) is burned, you can convert the mass to moles using the molar mass calculated in step 1:
Moles of C3H8 = 5.00 g / 44.11 g/mol

3. Use the balanced chemical equation to determine the stoichiometry:
From the balanced equation: C3H8 + 5O2 -> 3CO2 + 4H2O
We can see that one mole of propane (C3H8) will produce three moles of carbon dioxide (CO2). Therefore, moles of CO2 formed = 3 * (moles of C3H8)

4. Calculate the heat evolved using the enthalpy of combustion:
The enthalpy change (∆H) of combustion for propane is typically -2220 kJ/mol. Therefore, the heat evolved during the combustion of propane (C3H8) can be calculated as:
Heat evolved = (∆H of combustion) * (moles of C3H8)

Now that you have the steps, you can plug in the values and calculate the heat evolved during the combustion of 5.00 g of propane (C3H8).