percent composition 280 grams of CaO is dissolved in enough water to make 10 L of solution
To find the percent composition of CaO in the solution, we first need to calculate the molar mass of CaO.
The molar mass of CaO is:
Ca: 40.08 g/mol
O: 16.00 g/mol
Molar mass of CaO = 40.08 + 16.00 = 56.08 g/mol
Next, we need to find the number of moles of CaO in 280 grams:
Number of moles = mass / molar mass
Number of moles = 280 g / 56.08 g/mol = 4.99 mol
Now, we need to calculate the concentration of CaO in the solution:
Concentration = moles / volume
Concentration = 4.99 mol / 10 L = 0.499 mol/L
Finally, to find the percent composition of CaO in the solution, we need to multiply the concentration by the molar mass of CaO and then multiply by 100:
Percent composition = (concentration * molar mass) / mass of solution * 100
Percent composition = (0.499 mol/L * 56.08 g/mol) / (280 g + 10 L * 1000 g/L) * 100
Percent composition = (28.02 g) / 10,280 g * 100
Percent composition = 0.2727%
Therefore, the percent composition of CaO in the solution is approximately 0.2727%.