Question

If the heat of combustion of carbon in excess air is -3935 kJ, calculate the heat change when 60g of carbon undergoes complete combustion to produce carbon(IV) oxide. (C=12)

a) -1312.5 kJ
b) -2625 kJ
c) -3935 kJ
d) -5250 kJ

Answer 1

The heat change for the combustion of 60g of carbon to form carbon(IV) oxide is -19675 kJ, which does not match any of the provided options. This indicates a potential error in the question or the provided answers. None of the options are correct.

Step-by-step explanation:

To calculate the heat change when 60g of carbon undergoes complete combustion to produce carbon(IV) oxide, we need to first understand the given heat of combustion of carbon which is -3935 kJ per mole of carbon. Since the molar mass of carbon (C) is 12 g/mol, we can determine the number of moles in 60g of carbon:

Number of moles = mass (g) / molar mass (g/mol) = 60g / 12 g/mol = 5 moles of carbon.

Now we can find the total heat change for 5 moles of carbon by multiplying the number of moles by the heat of combustion per mole:

Heat change = moles × heat of combustion per mole = 5 moles × (-3935 kJ/mole) = -19675 kJ.

However, none of the options given match this value, suggesting there may be a mistake in the provided options or a misunderstanding in the question as presented. It is crucial to verify the data and the question to ensure accuracy.