Q: How many atoms of gold are present in $$9.66 \times 10$$^{-18}$$ moles of gold?

$$5.82 \times 10$$^{6}$$\ atoms$

Question 1

Which of the following is the correctly balanced equation for the reaction between silver nitrate and sodium carbonate to form silver carbonate and sodium nitrate?

Accepted Answer

$$2 \mathrm{AgNO}_3 + \mathrm{Na}_2\mathrm{CO}_3 \rightarrow \mathrm{Ag}_2\mathrm{CO}_3 + 2 \mathrm{NaNO}_3$$

Question 2

Calculate the molar mass of $$\mathrm{H}_2\mathrm{SO}_4 ($$sulfuric acid).

Accepted Answer

$$98.08\ \mathrm{g/mol}$$

Question 3

How many grams of sucrose ($$\mathrm{C}_{12}\mathrm{H}_{22}\mathrm{O}_{11}$$, molar mass $$342.30\ \mathrm{g/mol}) $$are present in $$0.571$$ moles?

Accepted Answer

$$195.5\ \mathrm{g}$$

Question 4

A patient requires $$800\ \mathrm{mL} of a$$ $$0.768\ \mathrm{M}$$ NaCl solution. If you have a $$10\ \mathrm{M}$$ NaCl stock solution, how much of the stock solution should you use?

Accepted Answer

$$61.4\ \mathrm{mL}$$

Question 5

How many atoms of gold are present in $$9.66 	imes 10$$^{-18}$$ moles of gold?

Accepted Answer

$$5.82 	imes 10$$^{6}$$\ atoms$

Question 6

What is the oxidation number of sulfur in $$\mathrm{H}_2\mathrm{SO}_3$$?

Accepted Answer

$$+4$$

Question 7

Which of the following is the net ionic equation for the reaction between $$\mathrm{KOH}$$ and $$\mathrm{CuCl}_2$$?

Accepted Answer

$$2 \mathrm{OH}^- (aq) + \mathrm{Cu}^{2+} (aq) \rightarrow \mathrm{Cu(OH)}_2 (s)$$

Question 8

How many grams of $$\mathrm{NaHCO}_3$$ are needed to neutralize $$25.68\ \mathrm{g} of$$ $$\mathrm{HCl}$$? (Molar masses: $$\mathrm{NaHCO}_3 = 84.01\ \mathrm{g/mol}$$, $$\mathrm{HCl} = 36.46\ \mathrm{g/mol})$$

Accepted Answer

$$59.22\ \mathrm{g}$$

Question 9

In the reaction $$4\mathrm{NH}_3 + 5\mathrm{O}_2 \rightarrow 4\mathrm{NO} + 6\mathrm{H}_2\mathrm{O}$$, if $$2.10\ \mathrm{g} of$$ $$\mathrm{NH}_3$$ reacts with $$2.60\ \mathrm{g} of$$ $$\mathrm{O}_2$$, what is the limiting reactant?

Accepted Answer

$$\mathrm{O}_2$$

Question 10

What is the oxidation number of cobalt in $$\mathrm{CoCO}_3$$?

Accepted Answer

$$+2$$

Question 11

Which of the following best defines a Brønsted-Lowry acid?

Accepted Answer

A substance that donates a proton ($$\mathrm{H}^+)$$

Question 12

How many grams of $$\mathrm{CO}_2$$ are produced from $$25.68\ \mathrm{g} of$$ $$\mathrm{HCl}$$ and excess $$\mathrm{NaHCO}_3$$? (Molar mass $$\mathrm{CO}_2 = 44.01\ \mathrm{g/mol})$$

Accepted Answer

$$30.99\ \mathrm{g}$$

Question 13

A solution contains $$0.154\ \mathrm{M}$$ NaCl and the average person has $$5.42\ \mathrm{L} of $$blood. How many grams of NaCl are in the average person? (Molar mass $$= 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$48.8\ \mathrm{g}$$

Question 14

What is the molar mass of $$\mathrm{Ca}_3(\mathrm{PO}_4)_2$$?

Accepted Answer

$$310.18\ \mathrm{g/mol}$$

Question 15

How many moles of $$\mathrm{Zn(NO}_3)_2$$ are present in $$296.21\ \mathrm{g}$$? (Molar mass $$= 189.41\ \mathrm{g/mol})$$

Accepted Answer

$$1.56\ \mathrm{mol}$$

Question 16

Which of the following is the correct complete ionic equation for the reaction between $$\mathrm{KOH}$$ and $$\mathrm{CuCl}_2$$?

Accepted Answer

$$2 \mathrm{K}^+ (aq) + 2 \mathrm{OH}^- (aq) + \mathrm{Cu}^{2+} (aq) + 2 \mathrm{Cl}^- (aq) \rightarrow 2 \mathrm{K}^+ (aq) + 2 \mathrm{Cl}^- (aq) + \mathrm{Cu(OH)}_2 (s)$$

Question 17

What is the oxidation number of sulfur in $$\mathrm{SCl}_6$$?

Accepted Answer

$$+6$$

Question 18

Which of the following best describes a base according to the Arrhenius definition?

Accepted Answer

A substance that increases the concentration of $$\mathrm{OH}^- in $$aqueous solution

General Chemistry Exam 2 Study Guidance

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