How many atoms of chlorine are there in 25.0 g of calcium chloride (CaCl₂)?

Question

Quizplus · Accepted Answer

The molar mass of CaCl2 is 110.98 g/mol. 
1 mol of CaCl2 contains 2 mol of Cl atoms. 
Therefore, the number of moles of Cl atoms in 25.0 g of CaCl2 is:
25.0 g CaCl2 * (1 mol CaCl2/110.98 g CaCl2) * (2 mol Cl/1 mol CaCl2) = 0.449 mol Cl
The Avogadro's number (6.022 × 10²³) gives the number of atoms per mole. 
So, the number of Cl atoms in 25.0 g of CaCl2 is:
0.449 mol Cl * (6.022 × 10²³ atoms/mol) = 2.71 × 10²³ atoms Cl
Therefore, the correct answer is C: 2.71 × 10²³ atoms.

How Many Atoms of Chlorine Are There in 25