Q: Which of the following is the correct calculation for percent yield?

$$\text{Percent yield} = \frac{\text{actual yield}}{\text{theoretical yield}} \times 100$$

Question 1

A sample of a compound contains 40.92% C, 4.58% H, and 54.50% O by mass. What is the empirical formula of this compound?

Accepted Answer

$$\mathrm{C}_3\mathrm{H}_4\mathrm{O}_3$$

Question 2

A compound has an empirical formula of CH and a molar mass of 78 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_6$$

Question 3

Combustion of 0.255 g of isopropyl alcohol produces 0.561 g of CO$$_2$$ and 0.306 g of H$$_2O. $$What is the empirical formula of isopropyl alcohol?

Accepted Answer

$$\mathrm{C}_3\mathrm{H}_8\mathrm{O}$$

Question 4

Which of the following is the correct calculation for percent yield?

Accepted Answer

$$	ext{Percent yield} = \frac{	ext{actual yield}}{	ext{theoretical yield}} 	imes 100$$

Question 5

A strip of zinc (2.00 g) reacts with 2.50 g of silver nitrate according to $$\mathrm{Zn} (s) + 2 \mathrm{AgNO}_3(aq) \rightarrow 2 \mathrm{Ag} (s) + \mathrm{Zn(NO}_3)_2(aq). $$Which reactant is limiting?

Accepted Answer

AgNO$$_3$$

Question 6

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

Accepted Answer

NaCl

Question 7

Which of the following is insoluble in water at 25$$^\circC$$?

Accepted Answer

Mg$$_3(PO$_4$$)$$_2$$

Question 8

What is the net ionic equation for the reaction between aqueous solutions of silver nitrate and potassium chloride?

Accepted Answer

$$\mathrm{Ag}^+(aq) + \mathrm{Cl}^-(aq) \rightarrow \mathrm{AgCl}(s)$$

Question 9

Which of the following equations represents the reaction of a weak base with water?

Accepted Answer

$$\mathrm{NH}_3(aq) + \mathrm{H}_2O(aq) \rightleftharpoons \mathrm{NH}_4^+(aq) + \mathrm{OH}^-(aq)$$

Question 10

Which of the following antacids contains magnesium hydroxide as an acid-neutralizing agent?

Accepted Answer

Milk of Magnesia

Question 11

Which of the following is a correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$\mathrm{H}^+(aq) + \mathrm{OH}^-(aq) \rightarrow \mathrm{H}_2O(l)$$

Question 12

Which of the following is a strong acid?

Accepted Answer

HNO$$_3$$

Question 13

A solution is prepared by dissolving 1.00 g of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6) in $$water. How many grams of water can be produced if all the glucose reacts with excess oxygen? (Reaction: $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2O)$$

Accepted Answer

$$0.600\ \mathrm{g}$$

Question 14

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which the maximum amount of solute has been dissolved and no more will dissolve.

Question 15

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

CH$$_3OH$$

Question 16

Which of the following reactions is a precipitation reaction?

Accepted Answer

$$\mathrm{AgNO}_3(aq) + \mathrm{KCl}(aq) \rightarrow \mathrm{AgCl}(s) + \mathrm{KNO}_3(aq)$$

Question 17

Which of the following is the correct sequence for determining the empirical formula from percent composition?

Accepted Answer

Convert percent to grams, grams to moles, divide by smallest number of moles, adjust to whole numbers.

Stoichiometry, Empirical and Molecular Formulas, and Reactions in Aqueous Solution

Study Guide - Practice Questions

Study Guide - Flashcards