What is the mass of exactly 1 million helium atoms? The atomic mass of helium is 4.00 u. A) 6.6 × 10⁻¹⁸ kg B) 6.0 × 10⁻¹⁷kg C) 6.6 × 10⁻²¹kg D) 6.0 × 10⁻²⁰ kg

Question

Quizplus · Accepted Answer

1 million helium atoms = 1,000,000 atoms

Mass of 1 helium atom = 4.00 u

Mass of 1 million helium atoms = (1,000,000 atoms) x (4.00 u/atom)

= 4,000,000 u

= 4,000,000 x (1.66 x 10^-27 kg/u)

= 6.64 x 10^-20 kg

Therefore, the correct answer is C: 6.6 x 10^-21 kg, since that is the only option that is close to 6.64 x 10^-20 kg.

What Is the Mass of Exactly 1 Million Helium Atoms