Multiple Choice
How many molecules are present in 4 moles of NH_3?
92
views
2. Atoms & Elements
Mole Concept
Multiple Choice
The chemical standard for the quantity of a mole is based on which substance?
A
Nitrogen-14
B
Carbon-12
C
Hydrogen-1
D
Oxygen-16
Verified step by step guidance1
Understand that the mole is a fundamental unit in chemistry used to count particles such as atoms, molecules, or ions.
Recall that the mole is defined based on a specific number of atoms of a particular isotope, which serves as the standard reference.
Identify the isotope historically used to define the mole: it is based on the number of atoms in exactly 12 grams of Carbon-12.
Recognize that Carbon-12 was chosen because it is a stable isotope and provides a convenient and precise standard for atomic mass measurements.
Conclude that the chemical standard for the quantity of a mole is based on Carbon-12, not Nitrogen-14, Hydrogen-1, or Oxygen-16.
Related Videos
Related Practice
