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Chemistry Question - Urgent

So I have this homework due in tomorrow morning and I am stuck on this question

I was wondering how to convert 0.155g/100cm^3 of Calcium Hydroxide (molecular mass: 74) into mol/dm^-3

Thanks!

Reply 1

Puddles the Monkey

Original post by qwerty123A

So I have this homework due in tomorrow morning and I am stuck on this question

I was wondering how to convert 0.155g/100cm^3 of Calcium Hydroxide (molecular mass: 74) into mol/dm^-3

Thanks!

Heya, I'm going to put this in the chemistry forum for you as you should get more responses there. :smile:

You should also check out the forum to see if there's any other threads there which might be helpful to you!

http://www.thestudentroom.co.uk/forumdisplay.php?f=130

Reply 2

charco

Study Forum Helper

Original post by qwerty123A

So I have this homework due in tomorrow morning and I am stuck on this question

I was wondering how to convert 0.155g/100cm^3 of Calcium Hydroxide (molecular mass: 74) into mol/dm^-3

Thanks!

divide mass by molar mass and make an adjustment so that you have 1 litre (i.e. divide by the number of litres you have)

Reply 3

khalidy95

easy question. divide 0.155g by 10 to convert it to g/dm^3. (ANS=0.0155g/dm3)

then you molecular mass is gmol^-1 so you divide 0.0155/74 to = 0.0002 mol dm^-3

Because g per dm^3 / g per mol the grams cancel so you are left with mol dm^3

Hope I am right lol.