Concentration of Solutions: Molar Concentration
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Questions and Answers

What is the molar concentration of a solution containing 1 mole of a substance dissolved in 2 liters of solution?

  • 2 M
  • 1 M
  • 3 M
  • 0.5 M (correct)

If 2 moles of a substance are dissolved in 500 mL of solution, what is the molar concentration?

  • 0.25 M
  • 3 M (correct)
  • 4 M
  • 1 M

What is the molar concentration of a solution prepared by dissolving 15 grams of NaCl into 250 mL of water?

  • 5 M
  • 0.15 M
  • 0.06 M (correct)
  • 2 M

If a solution contains 40 g of potassium chloride (KCl) in 750 mL, what is the molar concentration?

<p>0.2 M (A)</p> Signup and view all the answers

For a solution with 2 moles of a substance dissolved in 1 liter of water, what is the molar concentration?

<p>1.5 M (C)</p> Signup and view all the answers

If 30 grams of magnesium sulfate (MgSO₄) are dissolved in 500 mL of water, what is the molar concentration?

<p>0.3 M (A)</p> Signup and view all the answers

What would be the molar concentration if 3 moles of a substance are dissolved in 750 mL of solution?

<p>5 M (D)</p> Signup and view all the answers

Calculate the molar concentration for a solution with 20 grams of sulfuric acid (H₂SO₄) in 2 liters of water.

<p>5 M (C)</p> Signup and view all the answers

What is the molar concentration of a solution?

<p>The number of moles of solute divided by the volume of the solution in liters (A)</p> Signup and view all the answers

What is the formula for calculating the number of moles of a solute?

<p>n = mass of solute / molar mass of solute (B)</p> Signup and view all the answers

If you have 75 grams of NaCl (molar mass = 58.5 g/mol) dissolved in 2 liters of water, what is the molar concentration?

<p>1.28 M (C)</p> Signup and view all the answers

If the volume of a solution is given in milliliters (mL), how can it be converted to liters (L)?

<p>Divide by 1000 (A)</p> Signup and view all the answers

What are the units for molar concentration?

<p>moles per liter (mol/L) or M (A)</p> Signup and view all the answers

If you have a 500 mL solution containing 0.2 moles of solute, what is the molar concentration?

<p>0.4 M (D)</p> Signup and view all the answers

Which of the following is NOT required to calculate the molar concentration of a solution?

<p>Density of the solution (D)</p> Signup and view all the answers

Which formula is used to calculate the molar concentration (c) of a solution?

<p>$c = rac{n}{V}$ (B)</p> Signup and view all the answers

If 1 mole of NaCl is dissolved in 1 liter of solution, what is the molar concentration?

<p>1 M (C)</p> Signup and view all the answers

What is the molar concentration of a solution prepared by dissolving 10 grams of sodium hydroxide (NaOH) in 500 mL of water?

<p>0.5 M (D)</p> Signup and view all the answers

If a solution contains 25 grams of glucose (C₆H₁₂O₆) in 1.5 liters of solution, what is the molar concentration?

<p>0.093 M (D)</p> Signup and view all the answers

What is the molar concentration of a solution that contains 1 mole of a substance in 2 liters of solution?

<p>1 M (A)</p> Signup and view all the answers

What is the formula for calculating the number of moles (n) of a solute?

<p>$n = rac{m}{M}$ (A)</p> Signup and view all the answers

If a solution contains 40 grams of potassium chloride (KCl) in 750 mL, what is the molar concentration?

<p>1.5 M (B)</p> Signup and view all the answers

If 30 grams of magnesium sulfate (MgSO₄) are dissolved in 500 mL of water, what is the molar concentration?

<p>0.5 M (B)</p> Signup and view all the answers

If 75 grams of NaCl (molar mass = 58.5 g/mol) are dissolved in 2 liters of water, what is the molar concentration?

<p>1 M (C)</p> Signup and view all the answers

What is the formula for calculating molar concentration?

<p>c = n/V (B)</p> Signup and view all the answers

If a solution contains 2.5 moles of solute and has a volume of 1.5 liters, what is the molar concentration?

<p>1.67 M (B)</p> Signup and view all the answers

In the formula c = V/n, what does 'n' represent?

<p>Number of moles of solute (B)</p> Signup and view all the answers

If a solution contains 0.6 moles of a substance and has a volume of 400 mL, what is the molar concentration in mol/L?

<p>2.4 M (D)</p> Signup and view all the answers

What is the unit for molar concentration expressed in moles per liter?

<p>mol/L (D)</p> Signup and view all the answers

If you dissolve 10 grams of sucrose in water to make 500 mL of solution, what is the molar concentration?

<p>0.2 M (D)</p> Signup and view all the answers

What is the formula for calculating molar concentration (c) of a solution?

<p>c = n/V (C)</p> Signup and view all the answers

What is the molar concentration of a solution prepared by dissolving 25 grams of potassium permanganate (KMnO₄) in 500 mL of water?

<p>2.5 mol/L (B)</p> Signup and view all the answers

If a solution contains 0.75 moles of a substance and has a volume of 250 mL, what is the molar concentration?

<p>0.3 mol/L (B)</p> Signup and view all the answers

How can the number of moles of a solute be calculated when given its mass and molar mass?

<p>$n = \frac{mass}{molar \ mass}$ (C)</p> Signup and view all the answers

For a 300 mL solution with 1.5 moles of a substance dissolved, what is the molar concentration?

<p>0.5 mol/L (C)</p> Signup and view all the answers

What is the molar concentration of a solution made by dissolving 10 grams of calcium carbonate (CaCO₃) in 750 mL of water?

<p>$0.133 mol/L$ (A)</p> Signup and view all the answers

If a solution contains 0.4 moles of a substance and has a volume of 300 mL, what is the molar concentration?

<p>$1.33 mol/L$ (D)</p> Signup and view all the answers

'What is the correct formula to calculate the number of moles (n) of a solute?'

<p>$n = \frac{mass}{molar \ mass}$ (A)</p> Signup and view all the answers

If 0.75 moles of a substance are dissolved in 300 mL of solution, what is the molar concentration?

<p>$2.5 \text{ M}$ (C)</p> Signup and view all the answers

If 18 grams of glucose ($\ce{C6H12O6}$, molar mass = 180 g/mol) are dissolved in 2 liters of solution, what is the molar concentration?

<p>$0.05 \text{ M}$ (D)</p> Signup and view all the answers

If a solution has a molar concentration of 0.75 M and a volume of 400 mL, how many moles of solute are present?

<p>$0.3 \text{ mol}$ (C)</p> Signup and view all the answers

A 0.25 M solution of $\ce{NaOH}$ has a volume of 2 liters. How many grams of $\ce{NaOH}$ are present? (Molar mass of $\ce{NaOH}$ = 40 g/mol)

<p>$20 \text{ g}$ (D)</p> Signup and view all the answers

A solution contains 0.4 moles of $\ce{KCl}$ in 500 mL of water. What is the molar concentration?

<p>$0.8 \text{ M}$ (C)</p> Signup and view all the answers

If 50 grams of $\ce{NaOH}$ (molar mass = 40 g/mol) are dissolved in 2 liters of water, what is the molar concentration?

<p>$1.25 \text{ M}$ (C)</p> Signup and view all the answers

What is the molar concentration of a solution containing 0.15 moles of $\ce{HCl}$ in 300 mL of solution?

<p>$0.5 \text{ M}$ (A)</p> Signup and view all the answers

How many grams of $\ce{NaCl}$ (molar mass = 58.5 g/mol) are needed to make 500 mL of a 0.1 M solution?

<p>$2.925 \text{ g}$ (A)</p> Signup and view all the answers

A 0.5 M solution of $\ce{H2SO4}$ has a volume of 1.5 liters. How many moles of $\ce{H2SO4}$ are present? (Molar mass of $\ce{H2SO4}$ = 98 g/mol)

<p>$0.75 \text{ mol}$ (C)</p> Signup and view all the answers

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