Q: C$_{22}$H$_{24}$N$_2$O$_2$: How many nitrogen atoms are present in $8.0 \times 10^{-3}$ g of acrivastine? (1 mole contains $6.02 \times 10^{23}$ molecules)

There are $3.32 \times 10^{19}$ nitrogen atoms present.

Q: Which of the following reactions is a decomposition reaction?

$2\text{KClO}_3 (s) \rightarrow 2\text{KCl} (s) + 3\text{O}_2 (g)$

Question 1

A mixture of gases contains 50.00 g of N$_2$, 60.0 g of Ar, and 100.0 g of H$_2$. The mixture is held in a 500-L vessel at 30$^	ext{o}$C. What is the partial pressure (in atm) of N$_2$ in this mixture?

Accepted Answer

The pressure of N$_2$ is 0.357 atm.

Question 2

Consider the following reaction: $4	ext{NaN}_3 (s) + 	ext{O}_2 (g) ightarrow 6	ext{N}_2 (g) + 2	ext{Na}_2	ext{O} (s)$. In a certain experiment, 10.0 g of NaN$_3$ reacts with 30.0 g of O$_2$. How many grams of O$_2$ remain after the reaction is completed? Assume 100% destruction of the limiting reactant.

Accepted Answer

1.23 g

Question 3

A gas sample has a pressure of 1.00 atm when its volume is 200 mL. What will be the pressure of the gas if the volume is changed to 300 mL while the temperature is held constant?

Accepted Answer

0.667 atm

Question 4

Calculate the volume (in L) of 5.00 moles of an ideal gas if it has a pressure of 3.00 atm, and a temperature of 50.0$^	ext{o}$C.

Accepted Answer

The volume is 44.2 L.

Question 5

XeF$_4$ has ______ electron domain and ______ molecular geometry.

Accepted Answer

6, square planar.

Question 6

Which of the following is most likely NOT a gas at room temperature?

Accepted Answer

I$_2$

Question 7

A gas is confined to a cylinder with a movable piston. If the pressure decreases by a factor of 4 and temperature decreases by a factor of 2, how does the volume change?

Accepted Answer

The new volume will be 8 times the original volume.

Question 8

A patient's systolic pressure is measured as 128 mm Hg. What is this pressure in units of atm?

Accepted Answer

0.168 atm

Question 9

In a certain experiment, 5.00 g of PH$_3$ (g) reacts with 20.00 g of O$_2$ (g). How many grams of P$_2$O$_5$ (s) will form? (Assume 100% yield)

Accepted Answer

3.97 g of P$_2$O$_5$ will form.

Question 10

Which of the following is the correct molar mass for phytonadione, also known as vitamin K? The formula of phytonadione is C$_{31}$H$_{46}$O$_2$.

Accepted Answer

450.7 g/mol

Question 11

One mole of which of the following will contain the largest number of molecules?

Accepted Answer

All will contain the same number of molecules.

Question 12

C$_{22}$H$_{24}$N$_2$O$_2$: How many nitrogen atoms are present in $8.0 	imes 10^{-3}$ g of acrivastine? (1 mole contains $6.02 	imes 10^{23}$ molecules)

Accepted Answer

There are $3.32 	imes 10^{19}$ nitrogen atoms present.

Question 13

Balancing the following equation: CH$_4$ (g) + Cl$_2$ (g) $\rightarrow$ CCl$_4$ (l) + HCl (g). Pick the correct value of the coefficient in front of HCl (g) in your balanced chemical equation.

Accepted Answer

4

Question 14

Which of the following reactions is a decomposition reaction?

Accepted Answer

$2	ext{KClO}_3 (s) ightarrow 2	ext{KCl} (s) + 3	ext{O}_2 (g)$

Question 15

What is the hybridization of the atoms labeled as 1 and 2 in the following Lewis structure of nitrous acid (HNO$_2$)?

$\mathrm{H-O-N=O}$

Atom 1: O (single bonded to H and N), Atom 2: N (double bonded to O, single bonded to O)

Accepted Answer

$sp^3$, $sp^2$

Question 16

Choose the selection which approximately gives the value of the angles numbered 1, 2, and 3, respectively, in the figure below (benzene ring with attached carboxylic acid group):

Angle 1: C-C-C in benzene ring
Angle 2: O-C-O in carboxylic acid
Angle 3: C-O-H in carboxylic acid

Accepted Answer

Angle 1 is about 120$^	ext{o}$, angle 2 is about 120$^	ext{o}$, and angle 3 is about 109.5$^	ext{o}$

Question 17

Make the central atom in your Lewis structure follow the octet rule if possible. How many sigma and pi bonds are in one molecule of SO$_3$?

Accepted Answer

There are 3 sigma bonds and 3 pi bonds in one molecule of SO$_3$.

Question 18

Calculate the molar mass of a gas that has a density of 1.14 g/L at 117$^	ext{o}$C and 691 torr.

Accepted Answer

33.2 g/mol

Question 19

Which of the following statements is correct?

Accepted Answer

XeO$_4$ is non-polar.

Question 20

If the total pressure of the mixture is 3.93 atm, what is the partial pressure of CO$_2$?

Accepted Answer

The partial pressure of CO$_2$ is 0.948 atm.

GOB Chemistry Exam 2 Study Guide: Gases, Chemical Reactions, Molecular Geometry, and Bonding

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