Mole Concepts FiniteQuest

Mole Concepts

Avogadro’s Number and Moles, Molar Mass Calculation, Conversion of Mass to Moles, Volume of Gas at STP, Calculating Number of Atoms, Determining Empirical Formula, Limiting Reactant in Moles, Concentration and Moles in Solutions, Stoichiometric Ratios

1 / 10

If 4 moles of nitrogen gas react with hydrogen gas to produce ammonia according to the reaction N2+3H2→2NH3N₂ + 3H₂ \rightarrow 2NH₃, how many moles of NH₃ will be produced?

2 moles

4 moles

6 moles

8 moles

2 / 10

What is the number of moles of NaOH in 500 mL of a 2 M NaOH solution?

0.5 moles

1 mole

2 moles

0.25 moles

3 / 10

In the reaction 2H2+O2→2H2O2H₂ + O₂ \rightarrow 2H₂O, if you have 3 moles of H₂ and 1 mole of O₂, which is the limiting reactant?

H₂

O₂

H₂O

None, the reactants are in the correct ratio.

4 / 10

If a compound is composed of 1.2 moles of carbon and 1.8 moles of hydrogen, what is its empirical formula?

CH₂

C₂H₃

C₆H₆

5 / 10

How many hydrogen atoms are present in 2 moles of CH₄?

1.204 × 10²⁴ atoms.

4 × 6.022 × 10²³ atoms.

4.816 × 10²⁴ atoms.

1.204 × 10²³ atoms.

6 / 10

What volume will 0.5 moles of O₂ gas occupy at STP?

11.2 L.

22.4 L.

5.6 L.

44.8 L.

7 / 10

How many moles of NaCl are present in 117 grams of NaCl? (Molar mass of NaCl = 58.5 g/mol)

0.5 moles.

1 mole.

2 moles.

3 moles.

8 / 10

What is the molar mass of H₂O?

18 g/mol.

10 g/mol.

16 g/mol.

34 g/mol.

9 / 10

How many molecules are there in 2 moles of carbon dioxide (CO₂)?

6.022 × 10²³ molecules.

1.204 × 10²³ molecules.

3.011 × 10²³ molecules.

1.204 × 10²⁴ molecules.

10 / 10

The mole is defined as the amount of substance that contains:

6.022 × 10²³ electrons.

6.022 × 10²³ molecules.

6.022 × 10²³ particles.

6.022 × 10²³ grams.

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