Molar mass, sometimes referred to as molecular weight, is the mass of one mole of a substance, and is usually expressed in
A Liters
B Grams
C Density
D Moles
D?
The mole is derived from the quantity of atoms in 12 grams of carbon-12. The mole is just a number, it can be used for:
A Molecules
B Atoms
C Ions
D All of the above
D?
Calculate the molecular mass of calcium chloride (CaCl 2 ).
A 35.45 g/mol
B 110.98 g/mol
C 40.08 g/mol
D 75.53 g/mol
B?
Molar mass, sometimes referred to as molecular weight, is the mass of one mole of a substance, and is usually expressed in
D? NO !
Ca = 40 grams/ mol
Cl = 35.5 /mol times 2 = 71
40 + 71 = 111 yes B
To calculate the molar mass of a compound, you need to determine the atomic mass of each element in the compound and then add them up.
For calcium chloride (CaCl2), you have one calcium atom (Ca) and two chlorine atoms (Cl).
The atomic mass of calcium (Ca) is 40.08 g/mol, and the atomic mass of chlorine (Cl) is 35.45 g/mol.
So, to calculate the molecular mass of calcium chloride, you add:
(1 * 40.08 g/mol) + (2 * 35.45 g/mol) = 110.98 g/mol
Therefore, the correct answer is B) 110.98 g/mol.