Q: Which of the following is the correctly balanced equation for the formation of nitric oxide (NO) and water (H2O) from ammonia (NH3) and oxygen (O2)?

$$4\text{NH}_3 + 5\text{O}_2 \rightarrow 4\text{NO} + 6\text{H}_2\text{O}$$

Q: Which of the following is the balanced equation for the combustion of propane ($$\text{C}_3\text{H}_8) in $$oxygen?

$$\text{C}_3\text{H}_8 + 5\text{O}_2 \rightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$$

Q: Which of the following is the net ionic equation for the reaction between calcium chloride and sodium carbonate?

$$\text{Ca}^{2+} (aq) + \text{CO}_3$$^{2-}$$ (aq) \rightarrow \text{CaCO}_3 (s)$$

Question 1

Which of the following is the correctly balanced equation for the formation of nitric oxide (NO) and water (H2O) from ammonia (NH3) and oxygen (O2)?

Accepted Answer

$$4	ext{NH}_3 + 5	ext{O}_2 ightarrow 4	ext{NO} + 6	ext{H}_2	ext{O}$$

Question 2

A reaction between 1.81 L of $$1.30\,	ext{M} Ba(NO$_3$$)$$_2$$ and Na$$_2SO$_4$$ ($$0.50\,	ext{M}) $$produces BaSO$$_4 (s). $$What is the mass of BaSO$$_4$$ expected from this reaction? (Molar mass of BaSO$$_4$$ = $$233.39\,	ext{g/mol})$$

Accepted Answer

$$548\,	ext{g}$$

Question 3

For the reaction $$2	ext{Al} + 3	ext{MnO} ightarrow 	ext{Al}_2	ext{O}_3 + 3	ext{Mn}$$, if 110 g of Al and 200 g of MnO are used, which is the limiting reagent?

Accepted Answer

Manganese(II) oxide (MnO)

Question 4

Which of the following is the balanced equation for the combustion of propane ($$	ext{C}_3	ext{H}_8) in $$oxygen?

Accepted Answer

$$	ext{C}_3	ext{H}_8 + 5	ext{O}_2 ightarrow 3	ext{CO}_2 + 4	ext{H}_2	ext{O}$$

Question 5

If $$10.1\,	ext{g} of $$NaCl is dissolved in water and diluted to $$1.52\,	ext{L}$$, what is the molar concentration of NaCl? (Molar mass of NaCl = $$58.44\,	ext{g/mol})$$

Accepted Answer

$$0.111\,	ext{M}$$

Question 6

To prepare $$308\,	ext{mL} of$$ $$0.151\,	ext{M}$$ HCl from $$0.39\,	ext{M}$$ HCl, what volume of the concentrated solution should be used?

Accepted Answer

$$0.12\,	ext{L}$$

Question 7

When aqueous solutions of Na$$_2$$CrO$$_4$$ and FeCl$$_3$$ are combined, which precipitate is most likely to form?

Accepted Answer

Fe$$_2($$CrO$$_4$$)$$_3$$

Question 8

Which of the following is the net ionic equation for the reaction between calcium chloride and sodium carbonate?

Accepted Answer

$$	ext{Ca}^{2+} (aq) + 	ext{CO}_3$$^{2-}$$ (aq) ightarrow 	ext{CaCO}_3 (s)$$

Question 9

If powdered iron is mixed with zinc oxide, will a reaction occur? Why?

Accepted Answer

No, because iron is more noble than zinc and cannot reduce zinc oxide.

Question 10

A tin wire is added to a solution of copper nitrate. Will a reaction occur? Why?

Accepted Answer

Yes, because tin is more base than copper and can reduce copper ions.

Question 11

A $$50.00\,	ext{mL}$$ solution of HBr is titrated with $$42.21\,	ext{mL} of$$ $$0.1025\,	ext{M}$$ NaOH. What is the concentration of the HBr solution?

Accepted Answer

$$0.0866\,	ext{M}$$

Question 12

Which compound would you add to an aqueous solution of hydrochloric acid (HCl) to generate carbon dioxide (CO$$_2) $$gas?

Accepted Answer

Sodium carbonate (Na$$_2CO$_3)$$

Question 13

A gas initially at $$1.2\,	ext{atm} is $$expanded from $$1.7\,	ext{L} to$$ $$2.3\,	ext{L}$$ with all other variables unchanged. What is the final pressure?

Accepted Answer

$$0.89\,	ext{atm}$$

Question 14

A tire is inflated to $$40\,	ext{psi} at$$ $$80^\circ	ext{F} in $$Florida. The car is then driven to North Dakota, where the temperature is $$12^\circ	ext{F}. $$What is the air pressure in the tire, assuming constant volume?

Accepted Answer

$$35\,	ext{psi}$$

Question 15

For the reaction $$2	ext{H}_2 (g) + 	ext{O}_2 (g) ightarrow 2	ext{H}_2	ext{O} (g)$$ performed above $$100^\circ	ext{C}$$, what is the ratio of the final volume to the initial volume, assuming constant temperature and pressure?

Accepted Answer

$$\frac{2}{3}$$

Question 16

What is the volume of $$0.33\,	ext{mol} of an $$ideal gas at $$298\,	ext{K}$$ and $$1.32\,	ext{atm}$$?

Accepted Answer

$$6.11\,	ext{L}$$

Question 17

A chemist prepares acetylene gas (C$$_2H$_2) in a$$ $$0.523\,	ext{L}$$ flask at $$732\,	ext{mm Hg}$$, with water vapor pressure at $$18\,	ext{mm Hg}$$ and temperature $$293\,	ext{K}. $$How many moles of acetylene are present?

Accepted Answer

$$0.0209\,	ext{mol}$$

Question 18

A volatile organic compound is vaporized in a $$0.240\,	ext{L}$$ flask at $$150^\circ	ext{C}$$ ($$329\,	ext{K}). $$The flask weighs $$1.18\,	ext{g}$$ more after condensation. The barometer reads $$783\,	ext{mm Hg}. $$What is the molecular mass of the compound?

Accepted Answer

$$166\,	ext{g/mol}$$

General Chemistry: Chemical Reactions, Solutions, and Gases – Exam 2 Review Notes

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