How do I convert from kJ/kg to kJ/mol?

In summary, the conversation discusses how to convert the heat of combustion of isobutanol from kJ/kg to kJ/mol. The equation for determining the number of moles is mentioned, along with the molar mass of isobutanol. The concept of burning a mole versus burning one gram is also explained, with the final answer being 35.981 multiplied by 74.
  • #1
charlotteyip
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0
I have researched that isobutanol has a heat of combustion of 35981 kJ/kg; however I need this to be in kJ/mol. From calculations, the molar mass of isobutanol was found to be 74g/mol. How would I go about in converting this?

Relevant equations (?)
#mols=mass/molarmass

But how can I use this?
 
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  • #2
74g/mol
What is the heat of combustion of one gram?

35.981 kJ per gram
You get 35.981 kJ when you burn one gram, and a mole is 74 grams.
So wouldn't burning a mole just give you 74 times as much as burning one gram?

What is 35.981 multiplied by 74?
 
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  • #3
marcus said:
74g/mol
What is the heat of combustion of one gram?

35.981 kJ per gram
You get 35.981 kJ when you burn one gram, and a mole is 74 grams.
So wouldn't burning a mole just give you 74 times as much as burning one gram?

What is 35.981 multiplied by 74?
Thanks! I get it now :)
 

Related to How do I convert from kJ/kg to kJ/mol?

1. How do I convert from kJ/kg to kJ/mol?

The conversion from kJ/kg to kJ/mol involves using the molar mass of the substance. First, determine the molar mass of the substance in grams/mol. Then, divide the given value in kJ/kg by the molar mass to obtain the value in kJ/mol.

2. Can I use the same conversion factor for all substances?

No, the conversion factor will vary depending on the molar mass of the substance. Each substance has a unique molar mass, so the conversion factor will differ for each substance.

3. What is the significance of converting from kJ/kg to kJ/mol?

Converting from kJ/kg to kJ/mol allows for a comparison of different substances on a molar level. This is useful in chemistry and other scientific fields where the amount of substance plays a crucial role in calculations and analysis.

4. Is there a shortcut or formula for this conversion?

Yes, the formula is: kJ/kg x (1000 g/kg) x (1 mol/molar mass in grams) = kJ/mol.

5. How does this conversion relate to enthalpy and specific heat?

Enthalpy and specific heat are both extensive properties, meaning they are dependent on the amount of substance present. Converting from kJ/kg to kJ/mol allows for a comparison of these properties on a molar level, providing more accurate and meaningful data for analyses and calculations.

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