You are Here: Home

1. Ok, this is a question from my chemistry mock, I'll provide any information needed, I need to know how to work this out - in case it's in my real GCSE tomorrow. So help would be greatly appreciated!

Oops - forgot the formula of the compound! it's Ca Cl2 O2
Relative atomic masses:

Oxygen = 16, Chlorine = 35.5 Calcium = 40.

I already worked out that the relative atomic mass of calcium hypochlorite is 143.

The percentage by mass of chlorine in calcium hypochlorite works out to be: 49.7% - I worked that out too.

What I'm having difficulty with is:

They're asking me to calculate the mass of chlorine in a 20g tablet of calcium hypochlorite.

Can anyone shed light on how to do this?
2. You've worked out that the 49.7% of the mass of calcium hypochlorite is due to chlorine. So the mass of chlorine in a 20 g sample is simply 49.7 % of 20 g
3. Oh my god, I love you. Thank you so much! I have been near-tears over this question for hours, and you've solved it for me in less than 5 minutes! I'm going to rep you, if I can!
4. You're welcome . Good luck with your exam tomorrow.

EDIT: Lol you actually neg repped me but don't worry about it.

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 17, 2010
Today on TSR

### University open days

• University of East Anglia (UEA)
Could you inspire the next generation? Find out more about becoming a Secondary teacher with UEA… Postgraduate
Thu, 18 Oct '18
• University of Warwick
Sat, 20 Oct '18
• University of Sheffield