Answer:
2.17 moldm-3
Explanation:
Molarity is the number of moles of solute in a unit volume.
The atomic masses of
C -12
H-1
O-16
Therefore molar mass ( mass of 1 mol ) of ethanol ( CH3CH2OH )
( 12 x 2 ) + (1 x 6) + 16 = 46 g/mol
In 10 g of ethanol 10/46 mol should be present
So the molarity is (10/46) mol ÷ 100ml
= 10/ 46 mol ÷ 0.1 l
1L = 1 dm3
Therefore molarity = 10/46 mol ÷ 0.1 dm3
= 2.17 mol/dm3
