Homework from page 104

Homework from page 10415. Boron has two isotopes.

boron-10 mass = 10.013 amu

abundance = 19.8%

Boron-11

mass = 11.009 amu

abundance = 80.2%

Calculate its atomic mass.

Homework from page 104(mass x abundance) + (mass x abundance)

boron-10 mass = 10.013 amu

abundance = 19.8%

Boron-11

mass = 11.009 amu

abundance = 80.2%

Homework from page 104(mass x abundance) + (mass x abundance)

boron-10 mass = 10.013 amu

abundance = 19.8%

Boron-11

mass = 11.009 amu

abundance = 80.2%

Homework from page 104(mass x abundance) + (mass x abundance)

10.013 amu

x 19.8%

11.009 amu

x 80.2%

Homework from page 104(mass x abundance) + (mass x abundance)

10.013 amu

x .198

11.009 amu

x .802

Homework from page 104(mass x abundance) + (mass x abundance)

10.013 amu

x .198

1.983

11.009 amu

x .802

8.929

Homework from page 104(mass x abundance) + (mass x abundance)

10.013 amu

x .198

1.983

11.009 amu

x .802

8.829

Homework from page 104(mass x abundance) + (mass x abundance)

1.983 + 8.829

Homework from page 104(mass x abundance) + (mass x abundance)

1.983 + 8.829 10.812 amu

Homework from page 104(mass x abundance) + (mass x abundance)

1.983 + 8.829 10.812 amu

Homework from page 10416.Helium has two naturally

occurring isotopes, helium-3 and helium-4.

The atomic mass of helium is 4.003 amu.

Which isotope is more abundant in nature?

Homework from page 10416.Helium has two naturally

occurring isotopes, helium-3 and helium-4.

The atomic mass of helium is 4.003 amu.

Which isotope is more abundant in nature?

Homework from page 10417.Calculate the atomic mass of

magnesium. Three isotopes are:

mass = 23.985 amu, abund. = 78.99%

mass = 24.986 amu, abund. = 10.00%

mass = 25.982 amu, abund. = 11.01%

Homework from page 104

(mass x abundance)

mass = 23.985 amu, abund. = 78.99%

mass = 24.986 amu, abund. = 10.00%

mass = 25.982 amu, abund. = 11.01%

Homework from page 104

(mass x abundance)

23.985 x 78.99%

24.986 x 10.00%

25.982 x 11.01%

Homework from page 104

(mass x abundance)

23.985 x .7899

24.986 x .1000

25.982 x .1101

Homework from page 104

(mass x abundance)

23.985 x .7899 = 18.95 amu

24.986 x .1000 = 2.498 amu

25.982 x .1101 = 2.861 amu

Homework from page 104

(mass x abundance)

18.95 amu

2.498 amu

+ 2.861 amu

Homework from page 104

(mass x abundance)

18.95 amu

2.498 amu

+ 2.861 amu 24.31 amu

Homework from page 104

(mass x abundance)

18.95 amu

2.498 amu

+ 2.861 amu 24.31 amu

Homework from page 10421. Nitrogen has two naturally

occurring isotopes, N-14 and N-15.

The atomic mass of nitrogen is 14.007 amu.

Which isotope is more abundant in nature?

Homework from page 10421. Nitrogen has two naturally

occurring isotopes, N-14 and N-15.

The atomic mass of nitrogen is 14.007 amu.

Which isotope is more abundant in nature?

Daily Quiz

1. What element has 47 protons?

A. iron (Fe)

B. silver (Ag)

C. titanium (Ti)

D. platinum (Pt)

E. uranium (U)

Daily Quiz

2. What element has 12 electrons?

A. magnesium (Mg)

B. beryllium (Be)

C. chromium (Cr)

D. phosphorus (P)

E. carbon (C)

Daily Quiz

3. How many neutrons are in helium?

A. 1

B. 2

C. 3

D. 4

E. 5

Daily Quiz

4. How many protons are in sodium?

A. 1

B. 3

C. 11

D. 12

E. 23

Daily Quiz

4. How many electrons are in neon?

A. 1

B. 8

C. 10

D. 18

E. 20

Daily Quiz

5. How many neutrons are in carbon?

A. 2

B. 4

C. 6

D. 8

E. 12

Daily Quiz

1. What element has 47 protons?

A. iron (Fe)

B. silver (Ag)

C. titanium (Ti)

D. platinum (Pt)

E. uranium (U)

Daily Quiz

1. What element has 47 protons?

A. iron (Fe)

B. silver (Ag)

C. titanium (Ti)

D. platinum (Pt)

E. uranium (U)

Daily Quiz

2. What element has 12 electrons?

A. magnesium (Mg)

B. beryllium (Be)

C. chromium (Cr)

D. phosphorus (P)

E. carbon (C)

Daily Quiz

2. What element has 12 electrons?

A. magnesium (Mg)

B. beryllium (Be)

C. chromium (Cr)

D. phosphorus (P)

E. carbon (C)

Daily Quiz

3. How many neutrons are in helium?

A. 1

B. 2

C. 3

D. 4

E. 5

Daily Quiz

4. How many protons are in sodium?

A. 1

B. 3

C. 11

D. 12

E. 23

Daily Quiz

4. How many electrons are in neon?

A. 1

B. 8

C. 10

D. 18

E. 20

Daily Quiz

5. How many neutrons are in carbon?

A. 2

B. 4

C. 6

D. 8

E. 12

Daily Quiz