An unknown metal M reacts with aqueous sulfuric acid to form hydrogen gas and the divalent metal ion — Laboratory Chemistry Question
Question
An unknown metal M reacts with aqueous sulfuric acid to form hydrogen gas and the divalent metal ion M2+(aq). A student collects the hydrogen over water and calculates the molar mass of M based on the volume of hydrogen collected. Which error will result in a value of the calculated molar mass that is higher than the true molar mass?
A.
The concentration of sulfuric acid is 2.0 M rather than 1.0 M as recommended by the procedure.
B.✓ Correct
Some of the metal sample has oxidized to the metal oxide.
C.
The barometric pressure is assumed to be 760 torr when in fact it is 740 torr.
D.
The vapor pressure of water is not included in the calculation.
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