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# pv = nrt question

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1. Alkane X can be used as a fuel.

Complete combustion of 0.0117 mol of X produces 2.00 × 10–3 m3 of carbon dioxide gas,measured at 24.0 °C and 101 kPa.

Determine the molecular formula of X.Show all your working

Thanks for the help
2. (Original post by _Lizabeth_)
Alkane X can be used as a fuel.

Complete combustion of 0.0117 mol of X produces 2.00 × 10–3 m3 of carbon dioxide gas,measured at 24.0 °C and 101 kPa.

Determine the molecular formula of X.Show all your working

Thanks for the help
It's not help if we tell you the answer.

What exactly are you having trouble with?

Do you know how to work out the moles of gas using the ideal gas equation (which you have in the title)?
3. Convert to the correct units.
What out number of moles using ideal gas equation
Mr = mass/moles
4. Is heptane the correct answer?
5. (Original post by Ethan9133)
Yes
6. How many moles of CO2
Spoiler:
Show
use formula
What is Ratio of the moles of X to moles CO2
Spoiler:
Show
Divide by smallest
What is the formula of X
Spoiler:
Show
1:7 thus, 7 C's in co2 thus, 7 C's in X and use alkane General formula for number of H's

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