A sample of iron reacted with hydrochloric acid. The liberated hydrogen occupied 40.1 mL when collected over water at 27°C at a

Question

A sample of iron reacted with hydrochloric acid. The liberated hydrogen occupied 40.1 mL when
collected over water at 27°C at a barometric pressure of 750 torr. What is the mass of the sample of iron? (Because of the collection of gas over water, the vapor pressure of the water must be subtracted
from the barometric pressure to find the pressure of the hydrogen gas.)
If you wanted to prepare 50.0 mL of hydrogen, collected over water at 25°C on a day when the
barometric pressure was 730 torr, what mass of aluminum would you react with a hydrochloric acid?
(Balance the equation first.)
Al (s) + HCI (aq) → AICI3(aq) + _H₂(g)

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