An atom of helium has a mass about four times greater than that of an atom of hydrogen.Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements?
A)There are about four times as many helium atoms as hydrogen atoms.
B)There are about two times as many helium atoms as hydrogen atoms.
C)The number of helium and hydrogen atoms is the same.
D)There are about half as many helium atoms as hydrogen atoms.
E)There are about one-fourth as many helium atoms as hydrogen atoms.

Question

Quizplus · Accepted Answer

Since an atom of helium has a mass four times greater than that of the hydrogen atom, we would require one-fourth the number of helium atoms to have an equal mass of the two elements. Therefore, there are about one-fourth as many helium atoms as hydrogen atoms in equal masses of the two elements.

An Atom of Helium Has a Mass About Four Times