The molar volume of oxygen, in L, at 1.00 atmosphere and 100°C, is closest to
A. 30.6
B. 24.5
C. 22.4
D. 8.2

Solution.

Zinc metal reacts with 0.1 M hydrochloric acid to form hydrogen gas and zinc chloride solution.
The production of hydrogen gas is more vigorous if the zinc is powdered, rather than in large pieces, because the
A. activation energy of the reaction is lower.
B. activation energy of the reaction is higher.
C. frequency of collisions between zinc metal and hydrogen ions is higher.
D. fraction of reactant particles with sufficient energy to react is higher.

Solution

The concentration of K⁺ ions in 100 mL of 0.0500 M K₂CO₃ solution, in g/ L–, is
A. 0.196
B. 0.391
C. 1.96
D. 3.91

Solution

Carbon monoxide can be oxidised to carbon dioxide.
2CO(g) + O2(g) → 2CO2(g)
3 mol of CO and 2 mol of O2 are mixed.
When the reaction is complete there will be
A. 4 mol of CO2 produced.
B. 2 mol of CO2 produced.
C. 1 mol of CO unreacted.
D. 0.5 mol of O2 unreacted.

Solution