a) Fe2O3 b) Ca3P2
How many atoms of each element are contained in 200 g of each of the above compounds?
Fe2O3
mols Fe2O3 in 200 g Fe2O3. mols = grams/molar mass = ?
There are twice a many mols Fe and three times as many mols of O..
Then there are 6.02E23 atoms in a mole of anything. Post your work if you get stuck.
I understand it now. Thank you
To find out how many atoms of each element are contained in a given amount of a compound, you need to follow these steps:
Step 1: Find the molar mass of each compound.
To find the molar mass of a compound, you need to sum up the atomic masses of all the elements in the compound. You can find the atomic masses of the elements on the periodic table.
a) Fe2O3:
Molar mass of Fe = 55.845 g/mol (atomic mass of iron)
Molar mass of O = 16.00 g/mol (atomic mass of oxygen)
Molar mass of Fe2O3 = (2 * Molar mass of Fe) + (3 * Molar mass of O)
= (2 * 55.845 g/mol) + (3 * 16.00 g/mol)
b) Ca3P2:
Molar mass of Ca = 40.08 g/mol (atomic mass of calcium)
Molar mass of P = 30.97 g/mol (atomic mass of phosphorus)
Molar mass of Ca3P2 = (3 * Molar mass of Ca) + (2 * Molar mass of P)
= (3 * 40.08 g/mol) + (2 * 30.97 g/mol)
Step 2: Calculate the moles of each compound.
To calculate the moles, you divide the given mass of the compound by its molar mass.
a) Fe2O3:
Moles of Fe2O3 = Given mass of Fe2O3 / Molar mass of Fe2O3
= 200 g / Molar mass of Fe2O3 (calculated in Step 1)
b) Ca3P2:
Moles of Ca3P2 = Given mass of Ca3P2 / Molar mass of Ca3P2
= 200 g / Molar mass of Ca3P2 (calculated in Step 1)
Step 3: Determine the number of atoms.
To find the number of atoms, you multiply the moles of the compound by Avogadro's number (6.022 x 10^23 atoms/mol).
a) Fe2O3:
Number of atoms of Fe = Moles of Fe2O3 * (2 mol Fe / 1 mol Fe2O3) * (6.022 x 10^23 atoms/mol)
Number of atoms of O = Moles of Fe2O3 * (3 mol O / 1 mol Fe2O3) * (6.022 x 10^23 atoms/mol)
b) Ca3P2:
Number of atoms of Ca = Moles of Ca3P2 * (3 mol Ca / 1 mol Ca3P2) * (6.022 x 10^23 atoms/mol)
Number of atoms of P = Moles of Ca3P2 * (2 mol P / 1 mol Ca3P2) * (6.022 x 10^23 atoms/mol)
By following these steps, you can calculate the number of atoms of each element in 200 g of each compound.