Question

What is the molarity of a solution of 0.2 moles of Potassium Oxide

dissolved in 500 mL of water?*
0.4 M
12 M
0.1 M
O 1M

Please help I’m being timed

Answer 1

The molarity of a solution : 0.4 M

Further explanation

Given

0.2 moles of Potassium Oxide

500 ml of water = 0.5 L

Required

The molarity

Solution

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

`\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}`

Assume volume of solution = volume of water(addition of solution volume from volume Potassium Oxide is negligible

Input the value :

M = 0.2 : 0.5

M = 0.4