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Calculating concentration...
Does anyone know how you calculate concentration using the density?
I've got 20ml of acetone in a 200ml solution and i know the density of acetone is 0.787 g cm^3...
please help...
I've got 20ml of acetone in a 200ml solution and i know the density of acetone is 0.787 g cm^3...
please help...
Reply 1
ok
density = mass/volume
therefore, mass = density x volume
so if you have 20ml of acetone you have 20 x 0.787 g
divide this by the molar mass of acetone to get moles
= 15.68/58 = 0.270 moles
this number of moles in 200ml is the same concentration as 0.270/0.2 moles/litre
= 1.352 Molar
density = mass/volume
therefore, mass = density x volume
so if you have 20ml of acetone you have 20 x 0.787 g
divide this by the molar mass of acetone to get moles
= 15.68/58 = 0.270 moles
this number of moles in 200ml is the same concentration as 0.270/0.2 moles/litre
= 1.352 Molar
Reply 2
1
Thank you...
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