How many total atoms are in 0.560 g of P₂O₅?
molar mass P2O5 2*31 + 5*16 = estd 142
mols P2O5 in 0.560 g = g/molar mass = estd 0.004
So you have 2*0.004 = about 0.008 mols P
and 5 x 0.004 = about 0.02 mols O
Total mols = aout 0.008 + 0.2 = about 0.28
Now you know that 1 mol of anything has 6.02E23 anythings in it.
Remember all of these are estimates so you nee to redo all the calculations.
Post your work if you get stuck.
To find the total number of atoms in a given amount of a substance, you'll need to use the concept of molar mass and Avogadro's number.
Step 1: Calculate the molar mass of P₂O₅.
To calculate the molar mass of P₂O₅, you'll need to add up the atomic masses of phosphorus (P) and oxygen (O).
Phosphorus (P) has an atomic mass of 31.0 g/mol, and there are two atoms of phosphorus in P₂O₅.
Oxygen (O) has an atomic mass of 16.0 g/mol, and there are five atoms of oxygen in P₂O₅.
Molar mass of P₂O₅ = (2 x 31.0 g/mol) + (5 x 16.0 g/mol) = 62.0 g/mol + 80.0 g/mol = 142.0 g/mol.
Step 2: Calculate the number of moles.
To find the number of moles in 0.560 g of P₂O₅, divide the given mass by the molar mass.
Number of moles = Mass / Molar mass = 0.560 g / 142.0 g/mol.
Number of moles ≈ 0.0039 mol.
Step 3: Calculate the number of atoms.
To find the number of atoms, multiply the number of moles by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.
Number of atoms = Number of moles x Avogadro's number.
Number of atoms = 0.0039 mol x (6.022 x 10^23 atoms/mol).
Number of atoms ≈ 2.35 x 10^21 atoms.
Therefore, there are approximately 2.35 x 10^21 atoms in 0.560 g of P₂O₅.
To find the total number of atoms in a given mass of a compound, you need to use the concept of molar mass and Avogadro's number.
First, let's calculate the molar mass of P₂O₅ (diphosphorus pentoxide). The molar mass of an element is the mass of one mole of that substance. The atomic masses of phosphorus (P) and oxygen (O) are approximately 31.0 g/mol and 16.0 g/mol, respectively.
Molar mass of P₂O₅ = (2 * molar mass of P) + (5 * molar mass of O)
= (2 * 31.0 g/mol) + (5 * 16.0 g/mol)
= 62.0 g/mol + 80.0 g/mol
= 142.0 g/mol
Next, we need to calculate the number of moles of P₂O₅ in 0.560 g. To do this, divide the mass given by the molar mass of P₂O₅:
Number of moles = Mass / Molar mass
= 0.560 g / 142.0 g/mol
≈ 0.00394 mol
Now, we can use Avogadro's number, which tells us the number of entities (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately 6.02 × 10²³.
To find the total number of atoms, we multiply the number of moles by Avogadro's number:
Total number of atoms = Number of moles * Avogadro's number
≈ 0.00394 mol * 6.02 × 10²³
≈ 2.37 × 10²¹ atoms
Therefore, there are approximately 2.37 × 10²¹ atoms in 0.560 g of P₂O₅.