Stoichiometry - Jamb Chemistry Past Questions and Answers

Question 81:

• JAMB 2003

When 10g of sodium hydroxide is dissolved in 1000cm³ of water, the sodium formed is approximately
[Na = 23, H = 1, O = 16]

A. 0.01 mol dm^-3
B. 0.10 mol dm^-3
C. 0.25 mol dm^-3
D. 0.50 mol dm^-3

Question 82:

• JAMB 2004

If a solution contains 4.9g of tetraoxosulphate (VI) acid, calculate the amount of copper (II) oxide that will react with it
[Cu = 64, O = 16, S = 32, H = 1]

A. 0.8g
B. 4.0g
C. 40.0g
D. 80.0g

Question 83:

• JAMB 2004

What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of agas at s.t.p = 22.4 dm³

A. 112 cm²
B. 224 cm²
C. 448 cm²
D. 2240 cm²

Question 84:

• JAMB 2005

How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]

A. 0.20 mol
B. 0.10 mol
C. 1.12 mol
D. 0.56 mol

Question 85:

• JAMB 2005

The density of a certain gas is 1.98gdm^-3 at s.t.p. What is the molecular mas of the gas?

A. 44.0 g
B. 54.0 g
C. 26.0 g
D. 31.0 g