Question

Suppose you have 200.0 mL of a 0.750 M sodium hydroxide solution. How many

Answer 1

Answer:

0.15 moles of sodium hydroxide are in the solution.

Explanation:

Molarity is a unit for expressing concentration of solutions. Molarity is defined as the number of moles of solute per liter of solution.

The molarity of a solution is calculated by dividing the moles of the solute by the liters of the solution:

$Molarity (M)=\frac{number of moles of solute}{volume}$

Molarity is expressed in units ($\frac{moles}{liter}$).

So, a molarity of 0.750 M indicates that 0.750 moles are present in 1 L of solution. Then the following rule of three can be applied: if in 1000 mL (being 1 L = 1000 mL) there are 0.750 moles, in 200 mL how many moles are there?

$amount of moles=\frac{200 mL*0.750 moles}{1000 mL}$

amount of moles=0.15

0.15 moles of sodium hydroxide are in the solution.