Respuesta :

nkirotedoreen46

Answer:

0.07125 M

Explanation:

Concept tested: Molarity

What is molarity?

  • Molarity refers to the concentration of a solution in moles per liter.

How is molarity calculated?

  • Molarity is calculated by dividing the number of moles by the volume of the solution.
  • Molarity = Number of moles ÷ Volume

In this case, we are given;

  • Mass of NaHCO₂ is 1.935 g
  • Volume of the solution is 400 mL

We are required to calculate the molarity of NaHCO₂ solution;

We are going to use the following steps;

Step 1: Calculate the number of moles of NaHCO₂

Moles = Mass ÷ molar mass

Molar mass of NaHCO₂ = 68.0072 g/mol

Therefore;

Moles of NaHCO₂ = 1.935 g ÷ 68.0072 g/mol

                              = 0.0285 moles

Step 2: Calculate the molarity of NaHCO₂

We know that molarity = Moles ÷ Volume

Molarity =  0.0285 moles ÷ 0.4 L

              = 0.07125 moles/Liter

              = 0.07125 M

Thus, the molarity of the solution is 0.07125 M

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