(On the verge of tears) Calculate the final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water. Use M1V1 =M2V2. Round up answer to
the hundredths. Include unit.

The final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M

Explanation:

According to the dilution law,

where,  

= molarity of stock solution = 1.3  M

= volume of stock solution = 20 ml  

= molarity of diluted solution = ?

= volume of  diluted solution = (20+100) ml = 120 ml

Putting in the values we get:

Therefore  the final molarity of a 20mL- 1.3M salt solution after it has been diluted with 100ml water is 0.22 M