Which of the following statements about the mole is false?
a. the size of a mole of atoms has a reasonable mass.
b. a mole of a monatomic element corresponds to one avogadro's number of atoms.
c. one mole of a monatomic element has a mass equal to its atomic mass expressed in grams.
d. one mole of water contains 1/2 mole of oxygen atoms.
e. none of the above

It is false that d. One mole of water contains 1/2 mole of oxygen atoms.

Let's consider which of the following statements about the mole is false.

a. The size of a mole of atoms has a reasonable mass. TRUE. For instance, 1 mole of Na has a mass of 23 grams.

b. A mole of a monatomic element corresponds to one Avogadro's number of atoms. TRUE. A mole of atoms contains 6.02 × 10²³ atoms (Avogadro's number).

c. One mole of a monatomic element has a mass equal to its atomic mass expressed in grams. TRUE. For instance, the molar mass of Na is 23 g/mol and the atomic mass is 23 amu.

d. One mole of water contains 1/2 mole of oxygen atoms. FALSE. The molar ratio of H₂O to O is 1:1. Thus, 1 mole of H₂O contains 1 mole of O.

It is false that d. One mole of water contains 1/2 mole of oxygen atoms.

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The answer is D.

Explanation:

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the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .