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Basic Chemistry

Karen Timbelake, William Timberlake

Chapter 7

Chemical Quantities - all with Video Answers

Educators

Section 1

The Mole

02:03

Problem 1

Calculate each of the following:
a. number of Ag atoms in $0.200 \mathrm{~mol}$ of $\mathrm{Ag}$
b. number of $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}$ molecules in $0.750 \mathrm{~mol}$ of $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}$
c. number of $\mathrm{Cr}$ atoms in $1.25 \mathrm{~mol}$ of $\mathrm{Cr}$

Emily Himsel
Emily Himsel
Numerade Educator
02:17

Problem 2

Calculate each of the following:
a. number of $\mathrm{Ni}$ atoms in $3.4 \mathrm{~mol}$ of $\mathrm{Ni}$
b. number of $\mathrm{Mg}(\mathrm{OH})_{2}$ formula units in $1.20 \mathrm{~mol}$ of $\mathrm{Mg}(\mathrm{OH})_{2}$
c. number of $\mathrm{Li}$ atoms in $4.5 \mathrm{~mol}$ of $\mathrm{Li}$

Emily Himsel
Emily Himsel
Numerade Educator
01:50

Problem 3

Quinine, $\mathrm{C}_{20} \mathrm{H}_{24} \mathrm{~N}_{2} \mathrm{O}_{2}$, is a component of tonic water and bitter lemon.
a. How many moles of hydrogen are in $1.0 \mathrm{~mol}$ of quinine?
b. How many moles of carbon are in $5.0 \mathrm{~mol}$ of quinine?
c. How many moles of nitrogen are in $0.020 \mathrm{~mol}$ of quinine?

Jorge Villanueva
Jorge Villanueva
Numerade Educator
02:01

Problem 4

Aluminum sulfate, $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$, is used in some antiperspirants.
a. How many moles of sulfur are present in $3.0 \mathrm{~mol}$ of $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} ?$
b. How many moles of aluminum ions are present in $0.40 \mathrm{~mol}$ of $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} ?$
c. How many moles of sulfate ions $\left(\mathrm{SO}_{4}^{2-}\right)$ are present in $1.5 \mathrm{~mol}$ of $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} ?$

Jorge Villanueva
Jorge Villanueva
Numerade Educator
02:03

Problem 5

Calculate each of the following:
a. number of $\mathrm{C}$ atoms in $0.500 \mathrm{~mol}$ of $\mathrm{C}$
b. number of $\mathrm{SO}_{2}$ molecules in $1.28 \mathrm{~mol}$ of $\mathrm{SO}_{2}$
c. moles of $\mathrm{Fe}$ in $5.22 \times 10^{22}$ atoms of $\mathrm{Fe}$

Jorge Villanueva
Jorge Villanueva
Numerade Educator
01:57

Problem 6

Calculate each of the following:
a. number of Co atoms in $2.2 \mathrm{~mol}$ of $\mathrm{Co}$
b. number of $\mathrm{CO}_{2}$ molecules in $0.0180 \mathrm{~mol}$ of $\mathrm{CO}_{2}$
c. moles of $\mathrm{Cu}$ in $7.8 \times 10^{21}$ atoms of $\mathrm{Cu}$

Jorge Villanueva
Jorge Villanueva
Numerade Educator
02:31

Problem 7

Calculate each of the following in $2.00 \mathrm{~mol}$ of $\mathrm{H}_{3} \mathrm{PO}_{4}:$
a. moles of $\mathrm{H}$
b. moles of $\mathrm{O}$
c. atoms of $\mathrm{P}$
d. atoms of $\mathrm{O}$

Jorge Villanueva
Jorge Villanueva
Numerade Educator
02:43

Problem 8

Calculate each of the following in $0.185 \mathrm{~mol}$ of $\left(\mathrm{C}_{3} \mathrm{H}_{7}\right)_{2} \mathrm{O}$ :
a. moles of $\mathrm{C}$
b. moles of $\mathrm{O}$
c. atoms of $\mathrm{H}$
d. atoms of $\mathrm{C}$

Jorge Villanueva
Jorge Villanueva
Numerade Educator