mole calculation review

Mole Calculation Mole Calculation ReviewReview

Objective/Warm-UpObjective/Warm-Up SWBAT perform mole calculations.SWBAT perform mole calculations.

Explain the picture:Explain the picture:

Objective/Warm-UpObjective/Warm-Up SWBAT perform mole calculations.SWBAT perform mole calculations.

Warm-Up:Warm-Up: What is molar mass?What is molar mass? What is Avogadro’s number?What is Avogadro’s number?

Calculate the number of atoms in Calculate the number of atoms in 54.0 g of aluminum. 54.0 g of aluminum.

Ans:Ans:

1.20 x 101.20 x 102424 atoms atoms

3.000 moles Na = ______ 3.000 moles Na = ______ gramsgrams

Ans:Ans:

68.97 grams68.97 grams

5.00 moles Na = ________ 5.00 moles Na = ________ grams Nagrams Na

Ans:Ans:

115 grams115 grams

810. g Cl = _______ moles Cl810. g Cl = _______ moles Cl

Ans:Ans:

22.8 moles22.8 moles

3.27 moles of Cl = ____ atoms Cl3.27 moles of Cl = ____ atoms Cl

Ans:Ans:

1.97 x 10 1.97 x 10 24 24 atomsatoms

Rubidium has two common isotopes, Rubidium has two common isotopes, 8585Rb and Rb and 8787Rb. If the abundance of Rb. If the abundance of 8585Rb is 72.2% and the abundance of Rb is 72.2% and the abundance of 8787Rb is 27.8%, what is the average Rb is 27.8%, what is the average atomic mass of rubidium?atomic mass of rubidium?

85.56 amu85.56 amu

7.7 x 107.7 x 102525 atoms Ni = ____ g atoms Ni = ____ g NiNi

Ans:Ans:

7.5 x 107.5 x 1033 grams grams

56 g N = _______ moles N 56 g N = _______ moles N

Ans:Ans:

4.0 moles4.0 moles

1.7 moles Ca = _____ grams1.7 moles Ca = _____ grams

Ans:Ans:

68 grams68 grams

Uranium has three common isotopes. Uranium has three common isotopes. If the abundance of If the abundance of 234234U is 0.01%, the U is 0.01%, the abundance of abundance of 235235U is 0.71%, and the U is 0.71%, and the abundance of abundance of 238238U is 99.28%, what is U is 99.28%, what is the average atomic mass of the average atomic mass of uranium?uranium?

237.98 amu237.98 amu

0.033 moles Ne = _______ 0.033 moles Ne = _______ atomsatoms

Ans:Ans:

2.0 x 102.0 x 102222 atoms atoms

9.37 x 109.37 x 102626 atoms Ag = __ atoms Ag = __ molesmoles

Ans:Ans:

1.56 x 101.56 x 1033 moles (or 1560 moles (or 1560 moles) moles)

6.00 moles of Al = ______ 6.00 moles of Al = ______ atomsatoms

Ans:Ans:

3.61 x 103.61 x 102424 atoms atoms

Titanium has five common isotopes: Titanium has five common isotopes: 4646Ti (8.0%), Ti (8.0%), 4747Ti (7.8%), Ti (7.8%), 4848Ti (73.4%), Ti (73.4%), 4949Ti (5.5%), Ti (5.5%), 5050Ti (5.3%). What is the Ti (5.3%). What is the average atomic mass of titanium?average atomic mass of titanium?

47.92 amu47.92 amu

120. grams O = ___ atoms120. grams O = ___ atoms

Ans:Ans:

4.52 x 104.52 x 102424 atoms atoms

51 grams Zn = ______ moles51 grams Zn = ______ moles

Ans:Ans:

0.79 moles0.79 moles

1.2 x 101.2 x 102424 atoms C = ___ moles atoms C = ___ moles

Ans:Ans:

2.0 moles2.0 moles

6363Cu has an atomic mass of 62.9298 Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. amu and an abundance of 69.09%. The other isotope, The other isotope, 6565Cu, has an Cu, has an abundance of 30.91%. The average abundance of 30.91%. The average atomic mass between these two atomic mass between these two isotopes is 63.546 amu. Calculate the isotopes is 63.546 amu. Calculate the atomic mass of atomic mass of 6565Cu. Cu.

6565Cu = 64.9278 amu Cu = 64.9278 amu

6.0 moles H = _____ grams6.0 moles H = _____ grams

Ans:Ans:

6.0 grams6.0 grams

57.9 grams Ne = _________ atoms57.9 grams Ne = _________ atoms

Ans: Ans: 1.73 x 101.73 x 102424 atoms atoms

2424Mg (78.70%), Mg (78.70%), 2525Mg (10.13%), and Mg (10.13%), and 2626Mg (11.7%). The average atomic Mg (11.7%). The average atomic mass of the three isotopes is 24.3050 mass of the three isotopes is 24.3050 amu. If the atomic mass of amu. If the atomic mass of 2525Mg is Mg is 24.98584 amu, and 24.98584 amu, and 2626Mg is 25.98259 Mg is 25.98259 amu, calculate the actual atomic amu, calculate the actual atomic mass of mass of 2424Mg. Mg.

2424Mg = 23.80 amu Mg = 23.80 amu

8.56 x 108.56 x 102121 atoms = ______ g S atoms = ______ g S

Ans: Ans: 0.456 g S0.456 g S