Q: Which of the following statements about the mole is correct?

One mole of any substance contains $$6.02 \times 10$$^{23}$$ particles.

Question 1

Which of the following is the correct balanced equation for the combustion of propane, $$\mathrm{C_3H_8}$$, in oxygen?

Accepted Answer

$$\mathrm{C_3H_8} + 5\ \mathrm{O_2$} \rightarrow 3\ \mathrm{CO_2$} + 4\ \mathrm{H_2O}$$

Question 2

A sample of magnesium nitride is synthesized by reacting magnesium metal with nitrogen gas. Using the charge criss-cross method, what is the correct chemical formula for magnesium nitride?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 3

Which of the following statements about the mole is correct?

Accepted Answer

One mole of any substance contains $$6.02 	imes 10$$^{23}$$ particles.

Question 4

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 5

Which of the following is a decomposition reaction?

Accepted Answer

$$\mathrm{2KClO_3} \rightarrow 2KCl + 3O_2$$

Question 6

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 7

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

$$\mathrm{$$HNO_3$$}$$

Question 8

When 25.0 g of $$\mathrm{$$CaCO_3$$} is $$decomposed by heating, what is the theoretical yield of $$\mathrm{CO_2$} (in $$grams) produced? (Molar masses: $$\mathrm{$$CaCO_3$$} = 100.1 g/$$mol, $$\mathrm{CO_2$} = 44.0 g/$$mol)

Accepted Answer

$$11.0\ \mathrm{g}$$

Question 9

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions are mixed and an insoluble solid forms.

Question 10

Which of the following is the net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 11

A student mixes 50.0 mL of 0.200 M $$\mathrm{HCl}$$ with 50.0 mL of 0.200 M $$\mathrm{NaOH}. $$What is the concentration of $$\mathrm{NaCl}$$ produced in the final 100.0 mL solution?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 12

Which of the following is a correct statement about limiting reactants?

Accepted Answer

The limiting reactant is the reactant that is completely consumed first in a chemical reaction.

Question 13

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$$\%\ \mathrm{Yield} = \frac{\mathrm{Actual\ yield}}{\mathrm{Theoretical\ yield}} 	imes 100\%$$

Question 14

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 15

A 250.0 mL sample of a 1.50 M $$\mathrm{NaOH}$$ solution is diluted to a final volume of 750.0 mL. What is the new concentration?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 16

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

A reaction in which electrons are transferred between reactants.

Question 17

How many moles of ions are produced when 1.0 mole of $$\mathrm{Ca(NO_3$)_2} is $$dissolved in water?

Accepted Answer

3.0 moles

Question 18

A 0.100 M solution of $$\mathrm{H_2SO_4} is $$prepared. How many moles of $$\mathrm{H^+}$$ ions are present in 500.0 mL of this solution, assuming complete dissociation?

Accepted Answer

0.100 moles

Question 19

Which of the following is the correct net ionic equation for the neutralization of $$\mathrm{$$HClO_4$$}$$ with $$\mathrm{KOH}$$?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

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