How many formula units are in .25 mole of Na O ?
2
To find the number of formula units in 0.25 mole of Na2O, you need to use Avogadro's number and the molar mass of Na2O.
Step 1: Find the molar mass of Na2O
The molar mass of Na2O can be calculated by summing the atomic masses of sodium (Na) and oxygen (O). The atomic mass of sodium is 22.99 g/mol, and the atomic mass of oxygen is 16.00 g/mol. Since Na2O has two sodium atoms and one oxygen atom, we can multiply the atomic masses by their respective coefficients and add them up.
Molar mass of Na2O = (2 * 22.99 g/mol) + (1 * 16.00 g/mol) = 46.00 g/mol
Step 2: Use Avogadro's number to convert moles to formula units
Avogadro's number, denoted as NA, is approximately 6.022 x 10^23 formula units per mole.
To convert moles of Na2O to formula units, multiply the number of moles by Avogadro's number.
Number of formula units = 0.25 mole * (6.022 x 10^23 formula units/mol)
Number of formula units = 1.5055 x 10^23 formula units
Therefore, there are approximately 1.5055 x 10^23 formula units in 0.25 mole of Na2O.
well, how many in 1 mole (of anything!)?
6.02*10^23
so, what's .25 of that?