$3.34 \times 10^{23}$ molecules

$6.022 \times 10^{23}$, the number of particles in one mole

Question 1

Which of the following best describes valence electrons?

Accepted Answer

Electrons responsible for bonding and found in the outermost shell

Question 2

What is the molecular geometry and polarity of NH$_3$ (ammonia)?

Accepted Answer

Trigonal pyramidal, polar

Question 3

Which intermolecular force is present in all compounds, regardless of their composition?

Accepted Answer

London dispersion forces

Question 4

How many valence electrons are present in PCl$_3$?

Accepted Answer

$26$ valence electrons

Question 5

Which molecule exhibits hydrogen bonding?

Accepted Answer

H$_2$O

Question 6

What is the molar mass of Cr(NO$_3$)$_3$?

Accepted Answer

$241.996\ \mathrm{g/mol}$

Question 7

How many particles are present in $2.5$ moles of RbCl?

Accepted Answer

$1.6 	imes 10^{24}$ particles

Question 8

Convert $45^{\circ}\mathrm{C}$ to Kelvin.

Accepted Answer

$318\ \mathrm{K}$

Question 9

Which statement best explains the difference between electron geometry (EG) and molecular geometry (MG)?

Accepted Answer

EG considers both lone pairs and atoms bonded to the central atom, while MG differentiates between lone pairs and bonded atoms

Question 10

A sample contains $0.246$ g of CuCl$_3$. How many Cu atoms are present?

Accepted Answer

$8.72 	imes 10^{20}$ atoms

Question 11

Which molecule is non-polar due to equal sharing of electrons?

Accepted Answer

BF$_3$

Question 12

How many molecules are present in $10.0$ g of H$_2$O?

Accepted Answer

$3.34 	imes 10^{23}$ molecules

Question 13

What is the electron geometry and molecular geometry of CCl$_4$?

Accepted Answer

EG: tetrahedral, MG: tetrahedral

Question 14

Which intermolecular force is the strongest among the following?

Accepted Answer

Hydrogen bonding

Question 15

How many grams of CO$_2$ are present in $3.61 	imes 10^{23}$ molecules?

Accepted Answer

$22.0$ grams

Question 16

How many sodium ions are present in $25.0$ g of NaCl?

Accepted Answer

$2.58 	imes 10^{23}$ ions

Question 17

Which molecule has a bent molecular geometry and is polar?

Accepted Answer

H$_2$S

Question 18

How many grams are in $5.00 	imes 10^{24}$ molecules of C$_2$H$_6$?

Accepted Answer

$250$ grams

Question 19

Which of the following molecules exhibits dipole-dipole interactions?

Accepted Answer

NaCl

Question 20

What is Avogadro's number and what does it represent?

Accepted Answer

$6.022 	imes 10^{23}$, the number of particles in one mole

Bonding, Molecular Geometry, and Chemical Quantities: GOB Chemistry Study Notes

Study Guide - Practice Questions