Q: How many iron atoms are contained in 354 g of iron? (Fe molar mass = 55.85 g/mol)

$$3.82 \times 10$$^{24}$$ Fe atoms

Q: How many sulfur atoms are in 15.3 g of Au$$_2S$_3$$?

$$1.08 \times 10$$^{23}$$ S atoms

Question 1

Determine the electron geometry (eg) and molecular geometry (mg) of XeF$$_4.$$

Accepted Answer

eg = octahedral, mg = square planar

Question 2

Which of the following compounds contains at least one polar covalent bond but is nonpolar overall?

Accepted Answer

CF$$_4$$

Question 3

Give the hybridization for the carbon atom in HCN.

Accepted Answer

$$sp$$

Question 4

Consider the molecule below. What is the hybridization of the two labeled carbons?

(Structure: C$$_1 is $$bonded to three H and one Cl; C$$_2 is $$bonded to two H, one F, and one C$$_1)$$

Accepted Answer

C$$_1$$ = $$sp^3$$, C$$_2$$ = $$sp^2$$

Question 5

Describe a pi bond.

Accepted Answer

side by side overlap of p orbitals

Question 6

Which of the following Lewis structures has a pi bond?

Accepted Answer

H$$_2C=CH$_2$$

Question 7

Arrange the following molecules in order of increasing strength of intermolecular forces: CH$$_4$$, CH$$_3CH$_2CH$_3$$, CH$$_3CH$_3.$$

Accepted Answer

CH$$_4$$ \u003c CH$$_3CH$_3$$ \u003c CH$$_3CH$_2CH$_3$$

Question 8

Place the following substances in order of decreasing boiling point: H$$_2O$$, N$$_2$$, CO.

Accepted Answer

H$$_2O$$ \u003e CO \u003e N$$_2$$

Question 9

In liquid propanol, CH$$_3CH$_2CH$_2OH$$, which intermolecular forces are present?

Accepted Answer

Dispersion, hydrogen bonding, and dipole-dipole forces are present.

Question 10

Calculate the atomic mass of gallium if gallium has two naturally occurring isotopes with the following masses and natural abundances:
Ga-69: 68.9256 amu, 60.11%
Ga-71: 70.9247 amu, 39.89%

Accepted Answer

69.723 amu

Question 11

How many moles of potassium are contained in 300 g of potassium?

Accepted Answer

7.67 moles

Question 12

How many iron atoms are contained in 354 g of iron? (Fe molar mass = 55.85 g/mol)

Accepted Answer

$$3.82 	imes 10$$^{24}$$ Fe atoms

Question 13

Which of the following contains the MOST atoms? (You shouldn't need to do a calculation here.)

Accepted Answer

10.0 g H

Question 14

What is the molar mass of Pb$$_3(PO$_4$$)$$_2$$?

Accepted Answer

811.6 g/mol

Question 15

How many moles of Au$$_2S$_3$$ are in 15.3 g of Au$$_2S$_3$$? (Au = 192.967 amu, S = 32.066 amu)

Accepted Answer

0.0200 moles

Question 16

How many sulfur atoms are in 15.3 g of Au$$_2S$_3$$?

Accepted Answer

$$1.08 	imes 10$$^{23}$$ S atoms

Question 17

What are the missing coefficients to balance the equation below?
NH$$_3(g) + O$_2(g$$) $$\rightarrow N$_2(g) + H$_2O(l)$$

Accepted Answer

4, 3, 2, 6

Question 18

Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

Accepted Answer

Al(C$$_2H$_3O$_2$$)$$_3(aq) + (NH$_4$$)$$_3PO$_4(aq$$) $$\rightarrow$$ AlPO$$_4(s) + 3 NH$_4C$_2H$_3O$_2(aq)$$

General Chemistry: Molecular Structure, Bonding, Intermolecular Forces, and Stoichiometry Study Guide

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