What is the molarity of a solution prepared by dissolving 20.0 grams of naoh in sufficient water to make a solution with a total volume of 2.40 liters?
a. 0.120 m naoh
b. 0.208 m naoh
c. 0.416 m naoh
d. 0.833 m naoh

B. 0.208 M NaOH

Explanation:

Molarity is the number of moles of solute dissolved in 1 L of solution

we can use the following equation to find the molarity

molarity = number of moles of solute / volume of solution s

number of moles of NaOH dissolved - 20.0 g / 40 g/mol = 0.5 mol

volume of the solution = 2.40 L

substituting the values in the above equation

molarity = 0.5 mol / 2.40 L

molarity = 0.208 M

molarity of NaOH solution is

B. 0.208 M NaOH

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.