If 6g of pure carbon is completely burned

• naren11
In summary, to determine the mass of carbon needed to produce 39.3 kJ of heat when completely burned, we can use the equation C + O_2 \rightarrow C O_2 and the enthalpy values of the reactants and products. The enthalpy of pure carbon and oxygen gas is zero, while carbon dioxide has an enthalpy of -393.51 kJ/mol. By calculating the difference in enthalpy, we can determine the moles of carbon dioxide needed, and then work backwards to find the moles of carbon and ultimately the mass of carbon needed. This information can be found in charts in textbooks or online.
naren11
Ques: If 6g of pure carbon is completely burned, what mass of carbon must be burned to furnish 39.3 kj of heat?

For this ques, the equation would be $$C + O_2 \xrightarrow~ C O_2$$

well, iam stuck after this

Last edited:
well, we know that any reactant and product in its natural state has an enthalpy of zero.
Carbon, and Oxygen gas both are zero,
carbon dioxide has an enthalpy of -393.51 kJ/mol,
so the differenc of enthalpy of the products to the reactants is -393.51 kJ for every 1 mol of carbhon dioxide formed.so now figure out how many moles need to be formed to make 39.3 kJ, and then work backward to get the mols of carbon needed, then from that you can get the mass of the carbon needed.

how did u get the enthalpy of carbon, -393.51 kJ/mol, ?

I looked it up in a chart I have.
Many textbooks have charts with values of enthalpy, entropy, and free energy for common elements, usually located in the back appendixes or in the chapters pretaining to these values.
You can also find many more complete charts online.

1. How much carbon dioxide is produced when 6g of pure carbon is burned?

When 6g of pure carbon is completely burned, it will produce 22.68g of carbon dioxide.

2. What is the chemical equation for the combustion of 6g of pure carbon?

The chemical equation for the combustion of 6g of pure carbon is C + O2 → CO2.

3. Is the burning of 6g of pure carbon an exothermic or endothermic reaction?

The burning of 6g of pure carbon is an exothermic reaction, meaning it releases heat energy.

4. How does the burning of 6g of pure carbon contribute to climate change?

The burning of 6g of pure carbon releases carbon dioxide into the atmosphere, which is a greenhouse gas that contributes to climate change by trapping heat in the Earth's atmosphere.

5. Can the burning of 6g of pure carbon be used as a source of energy?

Yes, the burning of 6g of pure carbon can be used as a source of energy, as it releases heat energy during the combustion process. This is why carbon-based fuels, such as coal and gasoline, are commonly used for energy production.

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