How many argon atoms are contained in 7.66 × 10⁵ mmol of argon? A)4.61 × 10²⁶ Ar atoms B)1.84 × 10²⁸ Ar atoms C)1.15 × 10²⁸ Ar atoms D)7.86 × 10²⁰ Ar atoms E)3.24 × 10²⁶ Ar atoms

Question

Quizplus · Accepted Answer

1 mmol of any substance contains 6.022 × 10²³ representative particles (atoms, molecules, ions, etc.). Therefore, 7.66 × 10⁵ mmol of argon contains 7.66 × 10⁵ mmol × 6.022 × 10²³ Ar atoms/mmol = 4.61 × 10²⁹ Ar atoms.

How Many Argon Atoms Are Contained in 7