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$_2$Cr$_2$O$_7$ to 500 mL. What is the final molarity?

Accepted Answer

$0.437\ \mathrm{M}$

Question 5

When 0.500 mol of H$_2$C$_2$O$_4$ is combined with enough water to make a 3.00 L solution, what is the concentration of H$_2$C$_2$O$_4$ 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$_2$O$_3$ 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$^\circ$C 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$_2$C$_2$H$_2$O$_2$ 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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