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Paper Topic:

Chemistry

Using the average atomic masses given in Table 8 .1 , calculate the mass in grams , of each of the following samples

455 atoms of hydrogen

455 x (1 .008 (6 .022 x 1023 7 .62 x 10-22g H

b . 455 atoms of carbon

455 x (12 .01 (6 .022 x 1023 1 .99 x 10-23g C

2 . If an average sodium atom has the mass 3 .817 x 10-23 g , what is the mass of an average magnesium atom in grams ? What is the average mass of a potassium atom in grams

p Mg 24 .305 g / 6 .022 x 1023 4 .036 x 10-23 g

K 39 .098 g / 6 .022 x 1023 6 .493 x 10-23 g

3 . Using the average masses given inside the front cover of the text calculate the number of moles of each element represented in the following masses

a . 2 .411 g of helium , He

2 .411 g He x 1 mol He 0 .602 mol He

4 .003 g He

b . 62 .55 kg of iron , Fe

62 .55 kg Fe x 1000 g Fe x 1 mol Fe 1120 mol Fe

1 kg Fe 55 .845 g Fe

c . 4 .474 mg of fluorine , F

4 .474 mg F x 1 g F x 1 mol F 2 .35 x 10-4 mol F

1000mg F 18 .998 g F

4 . Using the average atomic masses given inside the front cover of the text , calculate the mass in grams of each of the following samples

a . 2 .71 x 10-4 mol of platinum , Pt

2 .71 x 10-4 mol Pt x 195 .078 g Pt 0 .053 g Pt

1 mol Pt

b . 4 .35 mol of uranium , U

4 .35 mol U x 238 .029 g U 1035 g U

1 mol U

c . 56 .2 mol of hydrogen , H

56 .2 mol H x 1 .008 g H 56 .65 g H

1 mol H

5 . Using the average atomic masses given inside the front cover of the text , calculate the number of atoms present in each of the following samples

a . 1 .50 g of silver , Ag

1 .50 g Ag x 1 mol Ag 0 .0097 mol Ag

107 .868g Ag

0 .0097 mol Ag x 6 .022 x 1023 molecules Ag 5 .86 x 1021 molecules Ag

1 mol Ag

5 .86 x 1021 molecules Ag x 1 atom Ag 5 .86 x 1021 atoms Ag

1 molecule Ag

b . 0 .0015 mol of copper , Cu

0 .0015 mol Cu x 6 .022 x 1023 molecules Cu x 1 atom Cu 9 .03 x 1020 atoms Cu

1 mol Cu 1 molecule Cu

c . 0 .0015 g of copper , Cu

0 .0015g Cu x 1 mol Cu x 6 .022 x 1023 molecules Cu x 1 atom Cu 1 .42 x 1019 atoms Cu

63 .546 g Cu 1 mol Cu 1 molecule Cu

6 . Calculate the molar mass for each of the following substances

a . methane , CH4...

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