WorksheetsStructure 1.4.1-1.4.4 Practice Questions
Total questions: 15
Worksheet time: 23mins
Which contains the greatest number of atoms?
32.0 g of Nitrogen gas (N₂)
3.01 x 10^23 atoms of Nitrogen (N)
0.5 mol of Nitrogen gas (N₂)
2.0 mol of Nitrogen atoms (N)
How many molecules are present in 44.0 g of CO2?
6.02 x 1023
3.01 x 1024
1.20 x 1023
5
What is the molar mass, M, of FeSO₄ .7H₂O?
278.01 g mol-1
278.01 g
280 g
278.01
What is the molar mass, M, of Pb(CO₃)₂?
327.22 g
327.22 g mol-1
327.22
250 g mol-1
How many atoms are present in one molecule of glucose, C₆H₁₂O₆?
24
18
12
6
What is the total number of hydrogen atoms in one molecule of glucose, C₆H₁₂O₆?
6
12
18
24
What is the percentage of carbon by mass in benzene, C₆H₆?
92.3
85.7
50.0
42.9
What is the percentage of carbon by mass in ethene, C₂H₄?
85.7
80.0
92.3
14.3
Which of the following pairs of compounds have the same empirical formula? I. ethene, C₂H₄ II. benzene, C₆H₆ III. cyclopropane, C₃H₆
I and II only
I and III only
II and III only
I, II and III
A compound contains 7.74% hydrogen and 92.26% chlorine by mass and has a molar mass of 76.96 g mol-1. What is its molecular formula?
HCl
H2Cl
H₆Cl2
H2Cl2
Which of the following pairs of compounds have the same empirical formula?
I. butanal, CH₃CH₂CH₂CHO
II. butanone, CH₃COCH₂CH₃
III. butanoic acid, CH₃CH₂CH₂COOH
I and II only
I, II and III
I and III only
II and III only
Which of the following pairs of compounds have the same empirical formula?
I. pentanal, CH₃CH₂CH₂CH₂CHO
II. 2,5-pentanedione, CH₃COCH₂CH₂COH₃
III. pentanoic acid, CH₃CH₂CH₂CH₂COOH
I and II only
I, II and III
I and III only
II and III only
Which of the following contains the same number of chloride ions as 0.3 mol CaCl₂?
0.2 mol NaCl
0.2 mol FeCl₃
0.3 mol NaCl
0.1 mol ZnCl₂
What is the relative formula mass of NaCl?
58.44
58.44 g mol-1
58.44 g
22.99
What is the relative formula mass of KCl?
74.55
39.10
35.45
58.44
