What is the percent by mass of Ca3N2?
%Ca = (3 x atomic mass Ca/molar mass)*100 = ??
%N = (2 x atomic mass N/molar mass)*100 = ??
To find the percent by mass of Ca3N2, you'll need to know the molar mass of Ca3N2 and the molar mass of each element in it.
First, let's calculate the molar mass of Ca3N2 by adding up the atomic masses of calcium (Ca) and nitrogen (N).
The atomic mass of Ca is approximately 40.08 g/mol, and since there are 3 calcium atoms in Ca3N2, the total mass contribution from calcium would be 3 * 40.08 g/mol.
The atomic mass of N is approximately 14.01 g/mol, and since there are 2 nitrogen atoms in Ca3N2, the total mass contribution from nitrogen would be 2 * 14.01 g/mol.
Now, add up these values to find the molar mass of Ca3N2:
(3 * 40.08 g/mol) + (2 * 14.01 g/mol) = 120.24 g/mol + 28.02 g/mol = 148.26 g/mol.
So, the molar mass of Ca3N2 is 148.26 g/mol.
To find the percent by mass of each element, divide the molar mass contribution of each element by the molar mass of Ca3N2, and then multiply by 100 to obtain the percentage.
For calcium:
(3 * 40.08 g/mol) / 148.26 g/mol * 100 = 80.48%
For nitrogen:
(2 * 14.01 g/mol) / 148.26 g/mol * 100 = 18.87%
Therefore, the percent by mass of calcium in Ca3N2 is approximately 80.48%, and the percent by mass of nitrogen is approximately 18.87%.