Moles, Molar Mass, and Mass percent of compounds

Moles, Molar Mass, and Mass percent of compounds

11th Grade

10 Qs

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Moles, Molar Mass, and Mass percent of compounds

Moles, Molar Mass, and Mass percent of compounds

Assessment

Quiz

Chemistry

11th Grade

Hard

Created by

Mahmoud Khamis

Used 3+ times

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10 questions

Show all answers

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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