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# Quick Solubility AS Question watch

1. Haven't really seen a question like this before :

The solubility of carbon dioxide, Mr 44, in water at 25 °C and atmospheric pressure is
0.145g/100g H2O.

Calculate its concentration in mol dm–3.

-----------

I started off trying to use the formula c = m/v

The moles would be mass/mr so 0.145/44 . I then done 0.145 over this total and end up with 2.2 .

Don't really know how to do it , also how do i convert gdm3 to mol dm3
2. (Original post by Tulian)
Haven't really seen a question like this before :

The solubility of carbon dioxide, Mr 44, in water at 25 °C and atmospheric pressure is
0.145g/100g H2O.

Calculate its concentration in mol dm–3.

-----------

I started off trying to use the formula c = m/v

The moles would be mass/mr so 0.145/44 . I then done 0.145 over this total and end up with 2.2 .

Don't really know how to do it , also how do i convert gdm3 to mol dm3
It's easier than you think. You are going about it correctly.

Moles of CO2 = 0.145/44

This in 100g water (equals 100ml)

So moles per litre = 10 * 0.145/44
3. (Original post by charco)
It's easier than you think. You are going about it correctly.

Moles of CO2 = 0.145/44

This in 100g water (equals 100ml)

So moles per litre = 10 * 0.145/44

Thanks

Okay I got the moles part, just not sure why you got the litres part and x it by 10 ? Why is 100ml needed ?
4. (Original post by Tulian)
Thanks

Okay I got the moles part, just not sure why you got the litres part and x it by 10 ? Why is 100ml needed ?
... because you are told how much dissolves in 100g = 100ml

... and you need moles per litre = 1000ml

Ten times as much.

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