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Chemistry Class Quiz: Solutions & Gases

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Questions and Answers

What is the mass of mercury consumed when eating 400 g of contaminated fish with a concentration of 0.427 ppm?

1.7 mg
0.057 mg
0.427 mg
0.171 mg (correct)

What is the vapor pressure of a solution containing 1.26 grams of naphthalene in 25 grams of benzene at 50°C?

261.3 mmHg (correct)
290 mmHg
250 mmHg
269.3 mmHg

What is the calculated molar mass of an enzyme that produces an osmotic pressure of 2.65 mmHg when 0.1 g is dissolved in 20 mL of benzene?

154 g/mol
2025 g/mol
35040 g/mol (correct)
500 g/mol

What is the volume of dry Argon gas at 25°C and 800 mmHg pressure given that 0.486 L of it has 80% humidity at 20°C and 790 mmHg?

<p>0.479 L (A)</p> Signup and view all the answers

At 20°C, what is the vapor pressure of water that affects the volume calculation of Argon gas at 80% humidity?

<p>17.53 mmHg (A)</p> Signup and view all the answers

Flashcards

Parts Per Million (ppm)

Concentration of a substance in a solution expressed as parts per million (ppm). It represents the mass of the solute per million units of mass of the solution.

Vapor Pressure

The pressure exerted by the vapor of a liquid in equilibrium with its liquid phase at a given temperature. It is a measure of the tendency of a liquid to evaporate.

Vapor Pressure Lowering

The phenomenon where the vapor pressure of a solvent is lowered when a non-volatile solute is added to it.

Osmotic Pressure

The pressure exerted by a solution across a semipermeable membrane against the pure solvent.

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Dry Gas Pressure

The pressure of a gas that would be present if all the water vapor were removed from the gas.