What is the molarity of a solution containing 2... - SS1 Chemistry Solutions and Concentration Question

Step 1: Convert the given mass of NaCl to moles.

Molar mass of NaCl = 22.99 g/mol (sodium) + 35.45 g/mol (chlorine) = 58.44 g/mol

Number of moles of NaCl = Mass of NaCl / Molar mass of NaCl

= 25 g / 58.44 g/mol

≈ 0.428 mol

 

Step 2: Convert the given volume of water to litres.

Volume of water = 500 mL = 500/1000 L = 0.5 L

 

Step 3: Calculate molarity using the formula:

Molarity (M) = Number of moles of solute / Volume of solution (in litres)

= 0.428 mol / 0.5 L

= 0.856 M

The molarity of the solution is 0.856 M.