Moles, Molar Mass, and Mass percent of compounds
Quiz
•
Chemistry
•
11th Grade
•
Hard

Mahmoud Khamis
Used 3+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the number of iron atoms in a 4.48 mole sample of iron
2.70 × 1024 Fe atoms
5.70 × 1024 Fe atoms
2.90 × 104 Fe atoms
1.30 × 1034 Fe atoms
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A silicon chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon (Si) atoms are present in the chip?
▫Convert mg to g : 5.68 mg X 10 -3
2.02 X 10 -4 atoms
1.22 X 10-7 atoms
2.23 X 1022 atoms
1.22 X 1020 atoms
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A sample of element silver (Ag) has a mass of 21.46 g. how many moles of silver are in sample? How many atoms of silver are in sample?
2.198 X 1020 atoms
0.1989 atoms
1.198 X 1023 atoms
1.178 X 1021 atoms
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What is the weight of 7.81 X 10 ²² atoms of Calcium?
5.19 g Co
4.19 g Co
12.14 g Co
7.10 g Co
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Cobalt (Co) is a metal that is added to steel to improve its resistance to corrosion. Calculate the number of moles in a sample of cobalt containing 5.00 X 1020 atoms
1.33 X 10 -12 mole
7.30 X 10 -2 mole
8.30 X 10 -4 mole
2.34 X 10 -3 mole
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the molar mass of potassium dichromate K₂Cr₂O₇
354.30 g/mole
294.20 g/mole
221.30 g/mole
122.20 g/mole
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What are the molecular weights of H₃PO₄
88.00 grams
91.00 grams
98.00 grams
92.00 grams
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