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Mole Fraction Calculation Practice

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Questions and Answers

What is the mole fraction of HCl in the solution?

0.803
0.134
0.197 (correct)
1.21

What is the molar mass of HCl?

72.06 g/mol
180.156 g/mol
44.2 g/mol
36.5 g/mol (correct)

What is the number of moles of H2O in the solution?

88.6 mol
6.13 mol
1.21 mol
4.92 mol (correct)

How do you calculate the molar mass of a compound?

Multiply the atomic masses by the respective subscripts and then sum (D) Signup and view all the answers

What is the chemical formula used to calculate the molar mass of glucose?

C6H12O6 (D) Signup and view all the answers

What is the atomic mass of oxygen?

16.00 g/mol (A) Signup and view all the answers

What is the advantage of expressing concentration in terms of mass?

It is less affected by temperature (A) Signup and view all the answers

What is the formula to compute percent by mass of a solution?

Percent by mass = (mass of solute / mass of solution) × 100% (D) Signup and view all the answers

In a 30% sugar solution, what is the mass of sugar in 100 grams of solution?

30 grams (C) Signup and view all the answers

What is the purpose of computing the percent by mass of a sodium chloride solution in an aquarium?

To maintain the same concentration as sea water (B) Signup and view all the answers

What is the fundamental difference between percent by mass and percent by volume?

The property of the solvent focused on (B) Signup and view all the answers

When is it more advantageous to express concentration in terms of volume?

When the solute and solvent are liquids or gases (D) Signup and view all the answers

What is the formula to calculate the percent by volume of a solution?

$\frac{\text{volume\ of\ solute}}{volume\ of\ solute + \ volume\ of\ solvent}$ ×100% (A) Signup and view all the answers

What is the volume of water in a 100.0 ml 70.0% (v/v) ethyl alcohol-water solution?

30.0 ml (D) Signup and view all the answers

What is the unit of molarity?

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

What is the formula to calculate the molarity of a solution?

M = $\frac{\text{moles\ of\ solute}}{\text{liter\ of\ solution}}$ (C) Signup and view all the answers

What is the mass of glucose in a 150.0-ml solution that is used to prevent dehydration?

6.60 g (C) Signup and view all the answers