If 4.00 g of NaCl are dissolved to make 2.00 L of solution, what is the molarity?

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Multiple Choice

If 4.00 g of NaCl are dissolved to make 2.00 L of solution, what is the molarity?

Explanation:
Molarity is the amount of solute in moles per liter of solution. To find it, convert the mass of solute to moles using its molar mass, then divide by the solution’s volume. NaCl has a molar mass of about 58.44 g/mol (Na 22.99 + Cl 35.45). The amount of NaCl in 4.00 g is 4.00 g ÷ 58.44 g/mol ≈ 0.06846 mol. The solution volume is 2.00 L, so the molarity is 0.06846 mol ÷ 2.00 L ≈ 0.03423 M, which rounds to 0.0342 M with the given significant figures. Thus, the molarity is 0.0342 M.

Molarity is the amount of solute in moles per liter of solution. To find it, convert the mass of solute to moles using its molar mass, then divide by the solution’s volume.

NaCl has a molar mass of about 58.44 g/mol (Na 22.99 + Cl 35.45). The amount of NaCl in 4.00 g is 4.00 g ÷ 58.44 g/mol ≈ 0.06846 mol. The solution volume is 2.00 L, so the molarity is 0.06846 mol ÷ 2.00 L ≈ 0.03423 M, which rounds to 0.0342 M with the given significant figures.

Thus, the molarity is 0.0342 M.

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