Q: A 100.0 g sample of bismuth tribromide, BiBr$$_3$$, contains:

$$1.32 \times 10$$^{23}$$ formula units of BiBr_3$

Q: How many molecules of XeF$$_6$$ are formed from 12.9 L of F$$_2 (at 298 K $$and 2.60 atm) according to the following reaction? Assume that there is excess Xe. $$\mathrm{Xe} + 3\mathrm{F}_2 \rightarrow \mathrm{XeF}_6$$

$$1.23 \times 10$$^{23}$$ molecules XeF_6$

Question 1

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of HF and KOH?

Accepted Answer

$$\mathrm{HF} + \mathrm{OH}^- \rightarrow \mathrm{F}^- + \mathrm{H}_2\mathrm{O}$$

Question 2

Pentacarbonyliron (Fe(CO)$$_5) $$reacts with phosphorous trifluoride (PF$$_3) $$and hydrogen, releasing carbon monoxide. What is the balanced equation for this reaction?

Accepted Answer

$$\mathrm{Fe(CO)_5} + 2\mathrm{PF_3$} + \mathrm{H}_2 \rightarrow \mathrm{Fe(CO)_2(PF_3$)_2(H_2$)} + 3\mathrm{CO}$$

Question 3

How many moles of carbon dioxide are there in 52.0 g of carbon dioxide?

Accepted Answer

$$1.18$$

Question 4

A solution is prepared by diluting 43.7 mL of 5.00 M aqueous K$$_2Cr$_2O$_7 to 500 mL. $$What is the final molarity?

Accepted Answer

$$0.437\ \mathrm{M}$$

Question 5

When 0.500 mol of H$$_2C$_2O$_4 is $$combined with enough water to make a 3.00 L solution, what is the concentration of H$$_2C$_2O$_4 in $$molarity?

Accepted Answer

$$0.167\ \mathrm{M}$$

Question 6

Which of the following is NOT a solid metal at normal conditions?

Accepted Answer

Hg

Question 7

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? $$\mathrm{Mg_3N_2} + 3\mathrm{H_2O} \rightarrow 2\mathrm{NH_3$} + 3\mathrm{MgO}$$

Accepted Answer

$$0.141$$

Question 8

Based on the equations below, which metal is the most active?
$$\mathrm{Pb(NO_3$)_2 (aq) + Ni (s) \rightarrow Ni(NO_3$)_2 (aq) + Pb (s)}$$
$$\mathrm{Pb(NO_3$)_2 (aq) + Ag (s) \rightarrow No\ reaction}$$
$$\mathrm{Ni(NO_3$)_2 (aq) + Cu (s) \rightarrow No\ reaction}$$

Accepted Answer

Ni

Question 9

A neutralization reaction between an acid and a metal hydroxide produces:

Accepted Answer

water and a salt

Question 10

What is the coefficient of oxygen in the balanced equation for the combustion of methanol, $$\mathrm{CH_3OH}$$, in air?
$$\mathrm{2CH_3OH + 3O_2 \rightarrow 2CO_2 + 4H_2O}$$

Accepted Answer

$$3$$

Question 11

The molarity (M) of an aqueous solution containing 22.5 g of glucose ($$\mathrm{C_6H_{12}O_6$}) in 355 mL of $$solution is:

Accepted Answer

$$0.354$$

Question 12

Chromium and chlorine form an ionic compound whose formula is $$\mathrm{$$CrCl_3$$}. $$What is the name of this compound?

Accepted Answer

chromium(III) chloride

Question 13

A 100.0 g sample of bismuth tribromide, BiBr$$_3$$, contains:

Accepted Answer

$$1.32 	imes 10$$^{23}$$ formula units of BiBr_3$

Question 14

The maximum amount of Al$$_2O$_3$$ that can be produced from 2.5 g of Al and 2.5 g of O$$_2 is$$:

Accepted Answer

$$4.7$$

Question 15

How many grams of sodium chloride are there in 550.0 mL of a 1.90 M aqueous solution of sodium chloride?

Accepted Answer

$$61.1$$

Question 16

A gas occupies 22.4 L at STP and 9.0 L at 100$$^\circC $$and 1.50 atm pressure. How many moles of gas did the system contain?

Accepted Answer

$$0.55$$\ moles$

Question 17

How many molecules of XeF$$_6$$ are formed from 12.9 L of F$$_2 (at 298 K $$and 2.60 atm) according to the following reaction? Assume that there is excess Xe.
$$\mathrm{Xe} + 3\mathrm{F}_2 \rightarrow \mathrm{XeF}_6$$

Accepted Answer

$$1.23 	imes 10$$^{23}$$ molecules XeF_6$

Question 18

What mass (in g) of AgCl is formed from the reaction of 75.0 mL of 0.078 M Ag$$_2C$_2H$_2O$_2$$ solution with 55.0 mL of 0.19 M MgCl$$_2$$ solution?
$$2\mathrm{Ag}_2\mathrm{C}_2\mathrm{H}_2\mathrm{O}_2 + 2\mathrm{MgCl}_2 \rightarrow 4\mathrm{AgCl} + \mathrm{Mg}_2\mathrm{C}_2\mathrm{H}_2\mathrm{O}_2$$

Accepted Answer

$$0.835$$

Question 19

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.81 atm. To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 653 mL at 1.81 atm?

Accepted Answer

$$813\ \mathrm{K}$$

General Chemistry Multiple Choice Review: Key Concepts and Applications

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