Chemistry Molar Concepts Quiz

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Questions and Answers

How many moles of carbon are present in 12 grams of carbon?

  • 3 moles
  • 1 mole (correct)
  • 2 moles
  • 0.5 moles

What is the molar mass of carbon dioxide (CO2)?

  • 36 grams per mole
  • 28 grams per mole
  • 52 grams per mole
  • 44 grams per mole (correct)

If 0.5 moles of a substance weigh 25 grams, what is the molar mass of the substance?

  • 25 grams per mole
  • 50 grams per mole (correct)
  • 75 grams per mole
  • 100 grams per mole

What is the concentration of a solution containing 0.25 moles of solute in 500 cm³ of solution?

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

How many grams of potassium hydroxide (KOH) are needed to make 500 mL of a 0.2 M solution?

<p>25 grams (A)</p> Signup and view all the answers

How many moles of oxygen atoms are present in 48 grams of oxygen (O2)?

<p>3 moles (B)</p> Signup and view all the answers

What is the empirical formula of a compound that consists of 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen?

<p>CH2O (D)</p> Signup and view all the answers

What is the molar mass of calcium hydroxide (Ca(OH)2)?

<p>74.1 g/mol (B)</p> Signup and view all the answers

How many moles are present in 36 grams of water (H2O)?

<p>1 mole (D)</p> Signup and view all the answers

What is the molar mass of sulfuric acid (H2SO4)?

<p>98 g/mol (C)</p> Signup and view all the answers

Flashcards

Moles of Carbon in 12g Carbon

1 mole of carbon atoms is present in 12 grams of carbon.

Moles in 36g Water (H2O)

2 moles of water molecules are present in 36 grams of H2O.

Molar Mass if 0.5 moles = 25g

The molar mass of the substance is 50 grams per mole.

Moles of Oxygen atoms in 48g O2

3 moles of oxygen atoms are present in 48 grams of O2 (oxygen gas).

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Molar Mass of Carbon Dioxide (CO2)

The molar mass of carbon dioxide (CO2) is 44 grams per mole.

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Molar Mass

The mass of one mole of a substance, expressed in grams per mole.

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Empirical Formula

The simplest whole-number ratio of atoms in a compound.

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Concentration

The amount of solute dissolved in a given volume of solution.

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Calculate grams of solute needed

To determine the mass of solute required to prepare a specific solution, use the formula: mass of solute = molarity x volume x molar mass.

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Molar Mass of Compounds

The sum of the atomic masses of all the atoms in the compound's chemical formula.

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Related Documents

Simple Moles Calculations_Import_to_Blooket.csv

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