Question

The mass of 2.50 mol of calcium atoms (atomic mass 40.08 amu) is approximately ___

A) 10.0 g.
B) 42.5 g.
C) 250 g.
D) 100 g.

Answer 1

The mass of 2.50 mol of calcium atoms is approximately 100 g.

Step-by-step explanation:

The molar mass of calcium (Ca) is 40.08 g/mol. The question asks for the mass of 2.50 mol of calcium atoms. To calculate this, we multiply the molar mass of calcium by the number of moles given.

Mass of calcium atoms = number of moles x molar mass

Mass of 2.50 mol of calcium atoms = 2.50 mol x 40.08 g/mol = 100.20 g

Therefore, the mass of 2.50 mol of calcium atoms is approximately 100 g (option D).