if you have 100 mg of CaCl2, how many moles of Cl do you have
How many moles do you have in 100 mg CaCl2? moles = grams/molar mass.
Then there are 2 Cl atoms/molecule of CaCl2.
To calculate the number of moles of Cl in 100 mg of CaCl2, we need to know the molecular weight of CaCl2 and the molar mass of Cl.
The molecular weight of CaCl2 is the sum of the atomic masses of calcium (Ca) and two chlorine atoms (Cl).
The atomic mass of Ca is approximately 40.08 g/mol.
The atomic mass of Cl is approximately 35.45 g/mol.
So, the molecular weight of CaCl2 is:
(1 * 40.08 g/mol) + (2 * 35.45 g/mol) = 110.98 g/mol.
Now, we can convert the mass of CaCl2 into moles using the following equation:
moles = mass / molar mass
Given that the mass of CaCl2 is 100 mg, which is equivalent to 0.1 g, and the molar mass is 110.98 g/mol, we can substitute these values into the equation to find the number of moles of CaCl2:
moles of CaCl2 = 0.1 g / 110.98 g/mol ≈ 0.0009 mol.
Since there are two chloride ions (Cl-) per CaCl2 molecule, the number of moles of Cl is double the number of moles of CaCl2:
moles of Cl = 2 * 0.0009 mol ≈ 0.0018 mol.
Therefore, if you have 100 mg of CaCl2, you would have approximately 0.0018 moles of Cl.