You are Here: Home

pv = nrt question watch

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)
Is heptane the correct answer?
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
7. (Original post by Ethan9133)
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
How did you do the second part ?

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 12, 2017
Today on TSR

Tuition fees under review

Would you pay less for a humanities degree?

Can I get A*s if I start studying now?

Discussions on TSR

• Latest
Poll
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE