Determine the number of molecules in 8.62 x 10^-3 g of dinitrogen pentoxide.
a) 4.80 x 10^19 molecules
b) 4.80 x 10^25 molecules
c) 4.80 x 10^23 molecules
d) 0.931 molecules
To pick up on oobleck's answer.
mols = grams N2O5/molar mass N2O5 = ?
molecules = mols x 6.02E23 molecules/mol = ?
To determine the number of molecules in a given amount of a substance, we need to use the concept of moles and Avogadro's number.
First, we need to calculate the number of moles in 8.62 x 10^-3 g of dinitrogen pentoxide. We can do this by dividing the given mass by the molar mass of dinitrogen pentoxide.
The molecular formula of dinitrogen pentoxide is N2O5. To calculate the molar mass, we need to determine the atomic masses of nitrogen (N) and oxygen (O) from the periodic table.
The atomic mass of nitrogen (N) is approximately 14.01 g/mol, and the atomic mass of oxygen (O) is approximately 16.00 g/mol.
Dinitrogen pentoxide has two nitrogen atoms and five oxygen atoms, so the molar mass can be calculated as follows:
Molar mass of N2O5 = (2 * atomic mass of N) + (5 * atomic mass of O)
= (2 * 14.01 g/mol) + (5 * 16.00 g/mol)
= 92.01 g/mol
Next, we can calculate the number of moles using the formula:
moles = mass / molar mass
= 8.62 x 10^-3 g / 92.01 g/mol
Now, let's calculate the number of moles:
moles = 8.62 x 10^-3 g / 92.01 g/mol
≈ 9.37 x 10^-5 mol
Finally, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol, to calculate the number of molecules:
number of molecules = moles * Avogadro's number
= 9.37 x 10^-5 mol * 6.022 x 10^23 molecules/mol
≈ 5.63 x 10^19 molecules
Therefore, the answer is not one of the given options. The correct answer is approximately 5.63 x 10^19 molecules.
how many moles is that?
Each mole has Avogadro's Number of molecule.