객관식
How many carbon atoms are present in 15.0 grams of graphite (pure carbon)? (Atomic mass of carbon = 12.01 g/mol)
119
views
2. Atoms & Elements
Calculating Molar Mass
Multiple Choice
What is the molar mass of magnesium (Mg) atoms?
A
12.0 g/mol
B
24.3 g/mol
C
32.1 g/mol
D
40.1 g/mol
검증된 단계별 안내1
Understand that the molar mass of an element is the mass of one mole of its atoms, usually expressed in grams per mole (g/mol).
Locate magnesium (Mg) on the periodic table to find its atomic mass, which represents the molar mass of magnesium atoms.
Note that the atomic mass listed on the periodic table is typically a weighted average of all naturally occurring isotopes of magnesium.
Use the atomic mass value directly as the molar mass of magnesium, since 1 mole of Mg atoms has a mass equal to this atomic mass in grams.
Confirm that the molar mass of magnesium is approximately 24.3 g/mol, which corresponds to the atomic mass found on the periodic table.
Related Videos
Related Practice
