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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:

[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).

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?

[tex]amount of moles=\frac{200 mL*0.750 moles}{1000 mL}[/tex]

amount of moles=0.15

0.15 moles of sodium hydroxide are in the solution.

samueladesida43

The amount of moles of sodium hydroxide (NaOH) in 200.0 mL of a 0.750 M sodium hydroxide solution is 0.15 moles.

HOW TO CALCULATE NUMBER OF MOLES:

  • The number of moles of a substance can be calculated by multiplying the molarity by its volume as follows:

  • no. of moles (mol) = molarity (M) × volume (V)

  • According to this question, 200.0 mL of a 0.750 M sodium hydroxide solution is given. The number of moles is calculated thus:

  • no. of moles = 0.750M × 0.2L

  • no. of moles = 0.15moles

  • Therefore, amount of moles of sodium hydroxide (NaOH) in 200.0 mL of a 0.750 M sodium hydroxide solution is 0.15 moles.

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