Turn on thread page Beta
 You are Here: Home

# AS Chemistry question watch

1. Find the modecular formula

0.02moles of a substance has a mass of 0.94g abd this mass contains 0.80g if mercury, the rest being chlorine.

The answer is Hg2Cl2.

Why?
2. (Original post by superkillball)
Find the modecular formula

0.02moles of a substance has a mass of 0.94g abd this mass contains 0.80g if mercury, the rest being chlorine.

The answer is Hg2Cl2.

Why?
Use the formula Moles = mass/Molecular Mass to find how many moles of each substance there is.....this finds the ratio 1:1 of the compounds...but this is empirical.

Since the number of moles you've calculated for each substance should be 0.01 of each....but you are told there are 0.02 moles present, this means that the actual formula is Hg2Cl2...as opposed to HgCl

Hope this helps

G
3. (Original post by gzftan)
Use the formula Moles = mass/Molecular Mass to find how many moles of each substance there is.....this finds the ratio 1:1 of the compounds...but this is empirical.

Since the number of moles you've calculated for each substance should be 0.01 of each....but you are told there are 0.02 moles present, this means that the actual formula is Hg2Cl2...as opposed to HgCl

Hope this helps

G
Why each substance should be 0.01 mole?
4. Because when u calculate the EF it comes out as 1:1
5. (Original post by jacie)
Because when u calculate the EF it comes out as 1:1
Why 1:1 should be 0.01 mole?

Turn on thread page Beta
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: March 5, 2004
Today on TSR

### Summer Bucket List is Back!

Start yours and you could win £150!

### GCSE Physics Equations sheet!

Poll
Useful resources

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

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.