If the relative mass of a hydrogen atom is 1/4 that of a helium atom,how many helium atoms would you need to equal the mass of 200 hydrogen atoms?
A)50
B)200
C)800
D)4
E)100

Question

Quizplus · Accepted Answer

Since the mass of a helium atom is 4 times that of a hydrogen atom, you would need 1/4 as many helium atoms to equal the mass of a given number of hydrogen atoms. Therefore, for 200 hydrogen atoms, you would need 200/4 = 50 helium atoms.

If the Relative Mass of a Hydrogen Atom Is 1/4