Percetnage by volume of propanol from original volumes

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To calculate the percentage by volume of propanol in a mixture of 500ml of water and 250ml of propanol, first determine the total volume. While a simple addition of the two volumes suggests a total of 750ml, this approach may not be accurate due to the non-additive nature of liquid volumes. For precise calculations, especially in scientific contexts, it is recommended to use partial molar volumes to account for potential volume contraction or expansion upon mixing.
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if i had 500ml of water and added 250ml of propanol, how would I go about working out its percentage by volume?

thanks
 
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What is the total volume?
 
It depends on what level of accuracy you need to work in. For many applications simply adding the volumes will yield an acceptable answer. However, volumes are not necessarily additive, and very precise work would use the partial molar volumes to determine such things.

For further reading: Partial Molar Property on Wikipedia
 

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