Question

What is the percent concentration when 9 g nacl are dissolved in 300ml of water?

Answer 1

3 % w/v

Explanation:

Since 300 ml of water containing 9 gm of NaCl
Hence 100 ml will have 3 gm of NaCl [ here 100 is treated as percent [%]. Cent means 100. Hence result is in per cent i.e percent.
Since the solid material [NaCl] taken measurement in weight that is in [ gm ] and Water is taken by measurement in volume that is in [ ml ] hence result expressed as Weight by Volume that is w/v.

Hence result si 3 % w/v