What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL? (i) 4 mol L-1 (ii) 20 molL-1 (iii) 0.2 molL-1 (iv) 2molL-1
Correct Answer: (iii) 0.2 molL-1
Explanation: The Molarity is defined as the number of moles per volume of the solution in litres.
Given,
Mass = 5.85g
Molar mass = 58.5 g/mol
Volume of the solution = 0.5 L
So,
Number of moles = mass/molar mass
Number of moles =5.85/58.5
Number of moles =0.1 mol
Hence,
Molarity = 0.1/0.5
Molarity = 0.2mol/L
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Hello student,
The formula for molarity M is
M = mol v
The moles of sodium chloride is 5.85 58.4 ≈ 0.1 mol
The volume of water is 0.5 l
So
M = mol v = 0.1 0.5 = 0.2 M
Cheers!
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