# Easy Explanation neededWatch

Announcements
#1

I've managed to do all up till the last question on my own but i got confused so dug up the mark scheme and was wondering if someone could explain why they times the 0.00492 moles by 40?

Thanks

Posted from TSR Mobile
0
5 years ago
#2
(Original post by benwalters1996)

I've managed to do all up till the last question on my own but i got confused so dug up the mark scheme and was wondering if someone could explain why they times the 0.00492 moles by 40?

Thanks

Posted from TSR Mobile
0.0492 moles is the amount of NaOH in 250cm3 of solution. It is multiplied by 40 because that is the relative mass of NaOH.
0
#3
Oh i didn't think of that thanks!

Posted from TSR Mobile
0
5 years ago
#4
That's why it is so important to list units. 40.0 is just a random number, 40.0 g/mol is a molar mass.
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• SOAS University of London
Wed, 29 May '19
• University of Exeter
Thu, 30 May '19
• Cranfield University
Cranfield Forensic MSc Programme Open Day Postgraduate
Fri, 31 May '19

### Poll

Join the discussion

Loved the paper - Feeling positive (191)
22.58%
The paper was reasonable (390)
46.1%
Not feeling great about that exam... (157)
18.56%
It was TERRIBLE (108)
12.77%