Question 1

A 275.0 mL sample of nitrogen monoxide (NO) is collected at 32.5 °C and 75 kPa. How many moles of NO are present in the sample? (Use $$R = 8.314 \ \mathrm{J/mol \cdot K})$$

Accepted Answer

$$0.0081$$ mol

Question 2

A vessel of volume $$22.4 \ \mathrm{L}$$ contains $$2.0$$ mol $$\mathrm{H_2$(g)}$$ and $$1.0$$ mol $$\mathrm{N_2$(g)} at$$ $$298 \ \mathrm{K}. $$What is the partial pressure of $$\mathrm{H_2$} in $$the vessel? (Use $$R = 0.0821 \ \mathrm{L \cdot atm/(mol \cdot K)})$$

Accepted Answer

$$2.18$$ atm

Question 3

Which intermolecular forces are present in $$\mathrm{NH_2OH}$$?

Accepted Answer

Dipole-dipole and hydrogen bonding

Question 4

How much heat (in kJ) must be supplied to $$300.0 g of $$water to raise its temperature from $$20.0 \ ^\circ \mathrm{C} to$$ $$100.0 \ ^\circ \mathrm{C}$$? ($$c = 4184 \ \mathrm{J/kg \cdot K})$$

Accepted Answer

$$80.0 kJ$$

Question 5

Which of the following best describes the criteria for a chemical reaction to be spontaneous at constant pressure and temperature?

Accepted Answer

$$\Delta G \u003c 0$$

Question 6

The vapor pressure of dimethyl ether at $$-58 \ ^\circ \mathrm{C} is$$ $$18.1$$ kPa and its enthalpy of vaporization is $$21.51 kJ/$$mol. What is the boiling point of dimethyl ether at $$1$$ atm? (Use $$1$$ atm $$= 101.3$$ kPa, $$R = 8.314 \ \mathrm{J/mol \cdot K})$$

Accepted Answer

$$-24 \ ^\circ \mathrm{C}$$

Question 7

Which solvent would best dissolve $$\mathrm{KCl}$$ and why?

Accepted Answer

Water, because it is polar and can stabilize ions

Question 8

Calculate the molality of a solution prepared by dissolving $$25.0 g of$$ $$\mathrm{NaCl} in$$ $$500.0 g of $$water. ($$M_{\mathrm{NaCl}} = 58.44 g/$$mol)

Accepted Answer

$$0.857$$ mol/kg

Question 9

Which intermolecular forces are present in $$\mathrm{$$CBr_4$$}$$?

Accepted Answer

London dispersion forces only

Question 10

For the reaction $$\mathrm{2AlCl_3(g) + 3H_2O(g) \rightarrow Al_2O_3(s) + 6HCl(g)}$$, what is the sum of the coefficients when the equation is balanced?

Accepted Answer

12

Question 11

Which of the following best explains why $$\mathrm{CH_3COOH} is $$more soluble in water than in benzene?

Accepted Answer

Because water can form hydrogen bonds with $$\mathrm{CH_3COOH}$$

Question 12

If the enthalpy of formation of TNT is $$267 kJ/$$mol, what does a positive value indicate about the stability of TNT?

Accepted Answer

TNT is less stable than its elements

Question 13

Which intermolecular forces are present in $$\mathrm{H_2O}$$?

Accepted Answer

London dispersion, dipole-dipole, and hydrogen bonding

Question 14

A reaction has $$\Delta H = 50 kJ/$$mol and $$\Delta S = 100 J/($$mol·K). At what temperature does the reaction become spontaneous?

Accepted Answer

$$T \u003e 500 K$$

Question 15

Which of the following is the correct form of the Clausius-Clapeyron equation for calculating the boiling point?

Accepted Answer

$$\ln \left( \frac{P_2$}{P_1$} \right) = -\frac{\Delta H_{vap}}{R} \left( \frac{1}{T_2$} - \frac{1}{T_1$} \right)$$

Question 16

Which of the following best explains why benzene is a poor solvent for $$\mathrm{KCl}$$?

Accepted Answer

Benzene is nonpolar and cannot stabilize ions

General Chemistry Midterm Exam Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards