How many grams of Cl are in 305 g CaCl2 ?
I am confused on how to start, but I found the molar mass of Ca is 40.08, Molar mass of Cl 2 is 70.906. I added those together to get 110.986.
I don't know the next step to incorporate 305g
mols CaCl2 = grams CaCl2/molar mass CaCl2.
Then mols Cl is twice that since there are two mols Cl for every 1 mol CaCl2.
Thank you
To determine the number of grams of chlorine (Cl) in 305 g of CaCl2, you can follow these steps:
1. Determine the molar mass of CaCl2:
- The molar mass of CaCl2 can be calculated by adding the molar masses of calcium (Ca) and chlorine (Cl):
Molar mass of Ca = 40.08 g/mol
Molar mass of Cl = 35.453 g/mol (since chlorine exists as Cl2, the atomic mass needs to be divided by 2)
Molar mass of CaCl2 = (40.08 g/mol) + 2 * (35.453 g/mol) = 110.986 g/mol (rounded to three decimal places)
2. Calculate the number of moles of CaCl2:
- To convert grams to moles, divide the given mass (305 g) by the molar mass of CaCl2:
Moles of CaCl2 = 305 g / 110.986 g/mol ≈ 2.751 mol (rounded to three decimal places)
3. Determine the grams of chlorine (Cl):
- Since there are two moles of chlorine in one mole of CaCl2, you can multiply the moles of CaCl2 by the molar mass of chlorine:
Grams of Cl = 2.751 mol * (35.453 g/mol) ≈ 97.558 g (rounded to three decimal places)
Therefore, there are approximately 97.558 grams of chlorine (Cl) in 305 grams of CaCl2.
To determine the number of grams of Cl in 305g of CaCl2, you need to use the molar ratio between Cl and CaCl2.
The molar mass of CaCl2 is indeed obtained by adding the atomic masses of its constituent elements: Ca (40.08 g/mol) and Cl (35.453 g/mol) x 2 (since there are two Cl atoms in each CaCl2 molecule), which equals 110.986 g/mol.
To find the number of moles of CaCl2 in 305g, you can use the formula:
moles = mass (in grams) / molar mass (in grams/mole)
moles of CaCl2 = 305g / 110.986 g/mol
Now that you have the number of moles of CaCl2, you can use the balanced equation for CaCl2 to determine the molar ratio between Cl and CaCl2, which is 2 moles of Cl for every 1 mole of CaCl2.
moles of Cl = moles of CaCl2 x (2 moles of Cl / 1 mole of CaCl2)
Finally, to find the mass of Cl, simply multiply the moles of Cl by the molar mass of Cl:
mass of Cl = moles of Cl x molar mass of Cl
mass of Cl = moles of Cl x 35.453 g/mol
Substitute the value you obtained for moles of Cl in the equation above to find the mass of Cl in grams.