Answer:
To determine the number of moles of CaCl2(s) in a sample of calcium chloride, we need to know the mass of the sample and the molar mass of CaCl2.
The molar mass of CaCl2 can be calculated as follows:
Atomic mass of Ca = 40.08 g/mol
Atomic mass of Cl (x2) = 35.45 g/mol x 2 = 70.90 g/mol
Molar mass of CaCl2 = 40.08 g/mol + 70.90 g/mol = 110.98 g/mol
So, if we have a sample of calcium chloride with a mass of, for example, 5 grams, we can calculate the number of moles as follows:
Number of moles = mass of sample / molar mass
Number of moles = 5 g / 110.98 g/mol
Number of moles = 0.045 moles (rounded to 3 decimal places)
Therefore, the sample contains 0.045 moles of CaCl2.
Step-by-step explanation: