A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?
mols = grams/molar mass
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To find the number of moles of CaCl2 in the solution, we can use the formula:
Number of moles = mass / molar mass
The molar mass of CaCl2 can be calculated by summing the atomic masses of calcium (Ca) and two chlorine (Cl) atoms:
Molar mass of Ca = 40.08 g/mol
Molar mass of Cl = 35.45 g/mol
Molar mass of CaCl2 = (40.08 g/mol) + 2*(35.45 g/mol) = 110.98 g/mol
Now we can calculate the number of moles:
Number of moles = 1.004 g / 110.98 g/mol
Using a calculator, this gives us:
Number of moles = 0.00904 mol
Therefore, the solution contains approximately 0.00904 moles of CaCl2.
To calculate the number of moles of CaCl2 in the solution, we need to use the formula:
Number of moles = mass / molar mass
1. First, we need to determine the molar mass of CaCl2.
The molar mass of calcium (Ca) is 40.08 g/mol and the molar mass of chlorine (Cl) is 35.45 g/mol. Since CaCl2 has two chlorine atoms, the molar mass of CaCl2 can be calculated as:
Molar mass of CaCl2 = (1 × molar mass of Ca) + (2 × molar mass of Cl)
= (1 × 40.08 g/mol) + (2 × 35.45 g/mol)
= 40.08 g/mol + 70.90 g/mol
= 110.98 g/mol
2. Now, we can calculate the number of moles of CaCl2 in the solution using the formula:
Number of moles = mass / molar mass
Number of moles of CaCl2 = 1.004 g / 110.98 g/mol
Calculating this value:
Number of moles of CaCl2 = 0.00904 mol
Therefore, the CaCl2 solution contains approximately 0.00904 moles of CaCl2.