Stoichiometry - Jamb Chemistry Past Questions and Answers

Question 111:

• JAMB 2018

A given amount of gas occupies 10.0dm5 at 4atm and 273°C. The number of moles of the gas present is [Molar volume of gas at s.t.p = 22.4dm\(^3\)]

A. 0.89 mol
B. 1.90 mol
C. 3.80 mol
D. 5.70 mol

Question 112:

• JAMB 2018

A given amount of gas occupies 10.0dm5 at 4atm and 273°C. The number of moles of the gas present is [Molar volume of gas at s.t.p = 22.4dm\(^3\)]

A. 0.89 mol
B. 1.90 mol
C. 3.80 mol
D. 5.70 mol

Question 113:

• JAMB 2018

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 \(^{23}\)mol]

A. 1.20 x 10\(^{22}\)
B. 2.4 x 10\(^{22}\)
C. 1.51 x 10\(^{22}\)
D. 3.02 x 10\(^{22}\)

Question 114:

• JAMB 2018

Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

A. 16
B. 48
C. 40
D. 12

Question 115:

• JAMB 2018

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

A. 196
B. 49
C. 106
D. 82