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# Chemistry AS mole calcuation question! help :( watch

1. Hello guys,

I am being really stupid here but i just dont know how to start this question please help!

8. 5.30 g of anhydrous sodium carbonate was dissolved in
water and made up to 250 cm3 in a volumetric flask. Which
one of the following is the concentration of sodium ions in
mol dm–3?

A 0.05
B 0.10
C 0.20
D 0.40

thanks xx
2. (Original post by Rachjin)
Hello guys,

I am being really stupid here but i just dont know how to start this question please help!

8. 5.30 g of anhydrous sodium carbonate was dissolved in
water and made up to 250 cm3 in a volumetric flask. Which
one of the following is the concentration of sodium ions in
mol dm–3?

A 0.05
B 0.10
C 0.20
D 0.40

thanks xx

Find the number of moles of sodium carbonate using the formula:
moles= mass/molar mass

Then using that answer use the formula:

Moles=volume x concentration/1000

But rearrange it to make concentration the subject

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