Stoichiometry - Jamb Chemistry Past Questions and Answers

Question 91:

• JAMB 2007

Calculate the mass of chlorine gas which occupies a volume of 1.12dm³ at s.t.p
[Cl = 35.5, molar volume of gas at s.t.p = 22.4 dm³

A. 15.50 g
B. 7.10 g
C. 3.55 g
D. 1.80 g

Question 92:

• JAMB 2007

What is the volume of oxygen required to burn complete 45 cm³ of methane at s.t.p?

A. 135.0 cm³
B. 180.0 cm³
C. 45.0 cm³
D. 90.0 cm³

Question 93:

• JAMB 2008

2Na_(s) + 2H₂O_(l) → 2NaOH_(aq) + H_2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]

A. 0.40g
B. 0.80g
C. 4.00g
D. 8.00g

Question 94:

• JAMB 2008

16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm³]

A. 22.40 dm³
B. 11.20 dm³
C. 2.24 dm³
D. 1.12 dm³

Question 95:

• JAMB 2008

300 cm³ of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume

A. 243.75 cm³
B. 369.23 cm³
C. 738.46 cm³
D. 1733.36 cm³