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

Question

Quizplus · Accepted Answer

To find the number of atoms of chlorine in calcium chloride, we first need to determine how many moles of calcium chloride are present in 25.0 g.

To do this, we can use the molar mass of calcium chloride:

CaCl2: (1 x 40.08 g/mol) + (2 x 35.45 g/mol) = 110.98 g/mol

25.0 g CaCl2 x (1 mol CaCl2/110.98 g CaCl2) = 0.225 mol CaCl2

Since there are 2 moles of chlorine atoms in each mole of calcium chloride, we can find the total number of chlorine atoms:

0.225 mol CaCl2 x (2 mol Cl/1 mol CaCl2) x (6.022 x 10^23 atoms/mol) = 2.71 x 10^23 atoms Cl

Therefore, the answer is (C).

How Many Atoms of Chlorine Are There in 25