You are Here: Home >< A-levels

How to do this CH5 question? Watch

1. Very stuck on this... have no clue :/
2. 2H2O2(aq) 2H2O(I) + O2(g) this was the equation! 1dm3 under 2H2O2 and 20dm3 under O2
3. Yeah, we know that there's 20dm3 of O2, so we can calculate the moles of O2 because we know its volume and its molar volume at 25 degrees. n=volume/molar volume = n=20/24 = 0.83

In the equation, H202 is 2moles while o2 is 1 mole so 2:1 ratio. So moles of h2o2 is 0.83 x 2 = 1.67moles

The volume of h2o2 in the reaction is 1dm3 so c=n/v = 1.67/1 = 1.67mol dm3

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: June 18, 2016
Today on TSR

Should I ask for his number?

Discussions on TSR

• Latest
• See more of what you like on The Student Room

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

• Poll

All the essentials

Student life: what to expect

What it's really like going to uni

Essay expert

Learn to write like a pro with our ultimate essay guide.

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Resources by subject

Everything from mind maps to class notes.

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• See more of what you like on The Student Room

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

• 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