Calculate the molarity of the following solutions: (a) 0.30 mol of solute in 80.5 mL of solution (b) 2.33 mol of KBr in 0.36 L of solution (c) 44.9 g of NaC2H3O2 in 1.53 L of solution (d) 90 . g of CuSO4 · 5H2O in 4.2 L of solution
Calculate the molarity of the following solutions:
(a) 0.30 mol of solute in 80.5 mL of solution
(b) 2.33 mol of KBr in 0.36 L of solution
(c) 44.9 g of NaC2H3O2 in 1.53 L of solution
(d) 90 . g of CuSO4 · 5H2O in 4.2 L of solution
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Molarity is defined as number of moles of solute present in 1000 ml of solution.
Number of moles of solute present in 80.5 ml of solution = 0.30 mol
Number of moles of solute present in 1 ml of solution = 0.30/80.5 = 0.00373 mol
Number of moles of solute present in 1000 ml of solution = 0.00373 × 1000 = 3.73 mol
Since 3.73 mol of solute is present in 1000 ml of solution, the concentration (M) of solution is 3.73 M.
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