Chemistry Questions HELP?

[匿名]

2015-12-19 11:40 pm

Part 1)
How many moles of atoms are in each elemental sample?

1.16 g Zn
29.2 g Ar
70.5 g Ta
2.28×10^−2 g Li

Part 2)
What is the mass in grams of each elemental sample?

6.67 mol W
0.582 mol Ba
68.3 mol Xe
1.56 mol S

Part 3)
How many atoms are in each elemental sample?

16.5 g Sr
26.8 g Fe
8.19 g Bi
33.9 g P

Thank you so much to whoever helps!

回答 (1)

Roger the Mole

2015-12-20 2:46 am

Part 1)
(1.16 g Zn) / (65.380 g Zn/mol) = 0.0177 mol Zn
(29.2 g Ar) / (39.9480 g Ar/mol) = 0.731 mol Ar
(70.5 g Ta) / (180.94788 g Ta/mol) = 0.390 mol Ta
(2.28 × 10^−2 g Li) / (6.9410 g Li/mol) = 0.00328 mol Li

Part 2)
(6.67 mol W) × (183.840 g W/mol) = 1226 g = 1.23 kg W
(0.582 mol Ba) × (137.3270 g Ba/mol) = 79.9 g Ba
(68.3 mol Xe) × (131.2930 g Xe/mol) = 8967 g = 8.97 kg Xe
(1.56 mol S) × (32.0655 g S/mol) = 50.0 g S

Part 3)
(16.5 g Sr) / (87.620 g Sr/mol) × (6.022 × 10^23 atoms/mol) = 1.13 × 10^23 atoms Sr
(26.8 g Fe) / (55.8452 g Fe/mol) × (6.022 × 10^23 atoms/mol) = 2.89 × 10^23 atoms Fe
(8.19 g Bi) / (208.9804 g Bi/mol) × (6.022 × 10^23 atoms/mol) = 2.36 × 10^22 atoms Bi
(33.9 g P) / (30.97376 g P/mol) × (6.022 × 10^23 atoms/mol) = 6.59 × 10^23 atoms P

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