Q: Which of the following is a correct application of dimensional analysis to convert $$25.0\ \mathrm{g} of$$ $$\mathrm{KBr} ($$molar mass $$119.0\ \mathrm{g/mol}) to $$moles?

$$25.0\ \mathrm{g} \times \dfrac{1\ \mathrm{mol}}{119.0\ \mathrm{g}}$$

Question 1

A solution is prepared by dissolving 5.00 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 250.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 2

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

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 3

A student mixes $$50.0\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}$$ $$\mathrm{$$AgNO_3$$}$$ with $$50.0\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}$$ $$\mathrm{NaCl}. $$What mass of $$\mathrm{AgCl} (s) $$will precipitate? ($$\mathrm{AgCl}$$ molar mass = $$143.32\ \mathrm{g/mol})$$

Accepted Answer

$$0.717\ \mathrm{g}$$

Question 4

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of $$\mathrm{Ba(NO_3$)_2}$$ and $$\mathrm{Na_2SO_4}$$?

Accepted Answer

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

Question 5

Which of the following is NOT a strong acid?

Accepted Answer

$$\mathrm{HF}$$

Question 6

A sample of gas occupies $$2.50\ \mathrm{L} at$$ $$25.0\ ^\circ\mathrm{C}$$ and $$1.00\ \mathrm{atm}. $$What volume will it occupy at $$50.0\ ^\circ\mathrm{C}$$ and $$1.00\ \mathrm{atm}$$? (Assume ideal gas behavior.)

Accepted Answer

$$2.71\ \mathrm{L}$$

Question 7

Which of the following pairs are conjugate acid–base pairs?

Accepted Answer

$$\mathrm{NH_4$^+}$$ / $$\mathrm{NH_3$}$$

Question 8

A $$25.0\ \mathrm{mL}$$ sample of $$0.100\ \mathrm{M}$$ $$\mathrm{H_2SO_4} is $$titrated with $$0.200\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$25.0\ \mathrm{mL}$$

Question 9

Which of the following statements about Dalton’s Law of Partial Pressures is correct?

Accepted Answer

The total pressure of a gas mixture is the sum of the partial pressures of each component gas.

Question 10

Which of the following is the correct balanced equation (with phases) for the reaction of aqueous sodium carbonate with aqueous hydrochloric acid?

Accepted Answer

$$\mathrm{Na_2CO_3 (aq) + 2HCl (aq) \rightarrow 2NaCl (aq) + H_2O (l) + CO_2$ (g)}$$

Question 11

A $$10.0\ \mathrm{g}$$ sample of $$\mathrm{$$CaCO_3$$}$$ reacts with excess $$\mathrm{HCl}$$ according to the equation: $$\mathrm{$$CaCO_3$$ (s) + 2HCl (aq) \rightarrow $$CaCl_2$$ (aq) + CO_2$ (g) + H_2O (l)}. $$What is the theoretical yield of $$\mathrm{CO_2$} (in $$grams)? (Molar masses: $$\mathrm{$$CaCO_3$$} = 100.09\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.01\ \mathrm{g/mol})$$

Accepted Answer

$$4.40\ \mathrm{g}$$

Question 12

Which of the following solutions has the lowest pH?

Accepted Answer

$$0.10\ \mathrm{M}\ \mathrm{HCl}$$

Question 13

Which of the following is a correct application of dimensional analysis to convert $$25.0\ \mathrm{g} of$$ $$\mathrm{KBr} ($$molar mass $$119.0\ \mathrm{g/mol}) to $$moles?

Accepted Answer

$$25.0\ \mathrm{g} 	imes \dfrac{1\ \mathrm{mol}}{119.0\ \mathrm{g}}$$

Question 14

Which of the following is the limiting reagent when $$2.00\ \mathrm{mol} of$$ $$\mathrm{H_2$}$$ reacts with $$1.00\ \mathrm{mol} of$$ $$\mathrm{O_2$} to $$form water according to $$2\mathrm{H_2$} + \mathrm{O_2$} \rightarrow 2\mathrm{H_2O}$$?

Accepted Answer

$$\mathrm{O_2$}$$

Question 15

A $$5.00\ \mathrm{L}$$ container holds $$2.00\ \mathrm{mol} of$$ $$\mathrm{O_2$}$$ gas at $$25.0\ ^\circ\mathrm{C}. $$What is the pressure in the container? ($$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$9.77\ \mathrm{atm}$$

Question 16

Which of the following is a weak base?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 17

A solution is made by diluting $$10.0\ \mathrm{mL} of$$ $$6.00\ \mathrm{M}$$ $$\mathrm{HCl} to a $$final volume of $$250.0\ \mathrm{mL}. $$What is the final concentration?

Accepted Answer

$$0.240\ \mathrm{M}$$

Question 18

Which of the following is a spectator ion in the reaction between $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$} in $$aqueous solution?

Accepted Answer

$$\mathrm{Na^+}$$

Question 19

A $$0.0100\ \mathrm{M}$$ solution of $$\mathrm{$$HNO_3$$}$$ has a pH of:

Accepted Answer

$$2.00$$

CHEM 141 – Exam 2 Study Guide: Chemical Reactions, Aqueous Chemistry, and Gases

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