Question

A chemist is studying a chemical compound that
has equal numbers of carbon atoms and hydrogen atoms. She calculates that the
carbon atoms have a mass of 24 grams. What is the mass of the hydrogen atoms?
Explain your reasoning.

Answer 1

It should be 24 they both have to be equally the same

Answer 2

The mass of hydrogen atoms in the compound would be 2 grams.

Stoichiometric calculation

The carbon atoms in the compound have a mass of 24 grams.

One carbon atom has a mass of 12 grams. Thus, there are two (12 x 2 = 24) carbon atoms in the compound.

This means that there are also two hydrogen atoms in the compound. One hydrogen atom weighs 1 gram. Hence, the mass of the hydrogen atoms in the compound will be 2 grams.

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