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Chemistry
UTME / JAMB 2022
Mass Volume Concepts
Solution
2H\(_2\) + O\(_2\) → 2H\(_2\)O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm\(^3\) of hydroden and 75cm\(^3\) of oxygen are involved
A
85cm\(^3\)
B
50cm\(^3\)
C
125cm\(^3\)
D
55cm\(^3\)
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2020
Mass Volume Concepts
Solution
How many moles of H\(_2\)SO4 are there in 50 cm\(^3\) of 0.108 mol dm\(^3\) solution of the acid?
A
5.4x 10
B
5.4 x 10\(^{-3}\)
C
5.4 x 10\(^{-2}\)
D
5.4x 10\(^{-1}\)
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 1991
Mass Volume Concepts
Solution
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3)
A
1.12dm3
B
2.24dm3
C
4.48dm3
D
11.2dm3
E
22.4dm3
medium Difficulty
Study Explanation