Stoichiometry - Jamb Chemistry Past Questions and Answers

Question 71:

• JAMB 2000

How many moles HCL will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

A. 14
B. 12
C. 11
D. 10

Question 72:

• JAMB 2001

25cm³ of a gas X contains Z molecules at 15^oC and 75 mmHg. How many molecules will 25 cm³ of another gas Y contain at the same temperature and pressure?

A. 2 Y
B. 2 Z
C. Z
D. Y

Question 73:

• JAMB 2001

What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
[H = 1, O = 16]

A. 36.0g
B. 8.0g
C. 72.0g
D. 16.0g

Question 74:

• JAMB 2001

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

A. 32
B. 20
C. 14
D. 12

Question 75:

• JAMB 2001

Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?

A. 125 ^oC
B. 150^oC
C. 175^oC
D. 250^oC