Question

Calculate the molarity of a solution made by adding 45.4 g of nano3 to a flask and dissolving it with water to create a total volume of 2.50 l. express your answer to three significant figures.

Answer 1

The molarity of a solution made by adding 45.4 g of NaNO3 to a flask and dissolving it with water to create a total volume of 2.50 L is 0.213 M.

Further Explanation:

Molarity  

• Molarity may be defined as the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V.  
• That is; Molarity = n/V, where n is the number of moles and V is the volume in liters.  
• Therefore; when given the molarity of a solution and the volume of the solution, then we can get the number of moles, by multiplying the molarity by volume;  
• Number of moles = Molarity x Volume
• Additionally, the number of moles of a compound or an element can also be calculated by dividing the mass of the compound by its relative molecular mass.

In this case:  

• Mass of NaNO3 = 45.4 g  
• But: Number of moles = Mass/ Molar mass
• Molar mass of NaNO3 is 84.995 g/mol  
• Thus; Number of moles = (45.4 g)/(84.995 g/mol)

                                      = 0.534 moles  

• Volume of the solution = 2.50 L  

But; Molarity = Number of moles/ Volume  

                     = 0.534 moles/2.50 L

                     = 0.2136 Moles/Liter  

                     = 0.213 M  

Keywords: Molarity, Moles, Volume

Learn more about:  

• Molarity: brainly.com/question/12834126
• Relationship between moles, molarity and volume: brainly.com/question/12834126

Grade: Middle  School

Subject: Chemistry

Chapter: Mole and stoichiometry equations

Answer 2

Solutions are made up of two non reacting species called solute and solvent. The amount of solute in solvent is known as concentration of that solute. Concentration is often measured in Molarity. Molarity is the amount of solute dissolved in 1 dm3 of solution. Answer to your question is as follow;