
Chapter 3 (Upgrade Yourself)
Authored by SYAZA BM
Chemistry
12th Grade

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45 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many atoms are contained in 25 g of NaBr? (Atomic mass of Na = 23, Br = 35)
102.96 molecules
0.24 molecules
1.45x1023 molecules
2.34 x 1020molecules
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Identify the number of Chlorine atoms in 65.8 g CaCl2.
7.14 x 1023 atoms
8.71 x 1023 atoms
1.22 x 1023 atoms
3.57 x 1023 atoms
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many molecules are in 2.00 moles of H2O?
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many grams are in 1.2 x 1024 molecules of CO? (molar mass of CO = 28 g/mol)
28.2 g
55.8 g
6.02 g
1.2 g
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student needs 65.0 g of copper(II) chloride for an experiment. How many atoms of copper is this?
2.91 x 10^23 atoms
3.91 x 10^25 atoms
2.35 x 10^23 atoms
4.70 x 10^23 atoms
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A mole of Neon contains
6.02 x 1023 _____.
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many moles are in 3.01 x 1022 atoms of magnesium?
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