Hydrogen gas is collected in a eudiometer tube over water as shown above.
The water level inside the tube is 40.8 millimeters higher than that outside.
The barometric pressure is 730.0 millimeters Hg. The water vapor pressure at
the room temperature of 29°C is found in a handbook to be 30.0 millimeters
Hg. What is the pressure of the dry hydrogen?
(A) 659.2 mm Hg
(B) 689.2 mm Hg
(C) 697.0 mm Hg
(D) 740.8 mm Hg
(E) 800.8 mm Hg
Which substance is being oxidized in the following reaction?
HBr(aq) + Mg(s) → MgBr 2 (aq) + H 2 (g)(A) Hydrogen
(B) Magnesium
(C) Bromine
(D) Hydrogen bromide
(E) None of the substances are being oxidized; it is not a redox
reaction.