# Homework Help: AS Practise Chemistry coursework question

1. Mar 18, 2012

### Bennybo100

1. The problem statement, all variables and given/known data

Write an equation in words to show relationship between mass concentration, molar concentration and molar mass and give a short explanation.

2. Relevant equations

I understand that the equation is:

molar mass = Mass concentration/Molar concentration

3. The attempt at a solution

Where it says 'give a short explanation', what exactly does it want me to say? Does it have something to do with the equation no. moles = Mass/Mr?

2. Mar 18, 2012

### Staff: Mentor

I would put the equation in the form

$$\text{molar concentration} = \frac{\text{mass concentration}}{\text{molar mass}}$$

in which case it is much more obvious why it is related to the other equation you listed.

3. Mar 18, 2012

### Bennybo100

Thank you very much!

I'm not too good at all this terminology, so could you help me a bit more?

Does rearranging the equation to what you've stated mean that it is the same as the equation no. moles = Mass/Mr? Is this the 'short explanation' the question requires?

Thanks for the help,
Ben.

4. Mar 18, 2012

### Staff: Mentor

It is not the same but the analogy is obvious. You may try to write both equations with units and see how they differ.