Calculate the number of formula units in 292.5g sodium chloride
formula units = grams/formula unit weight = ?
To calculate the number of formula units in 292.5g of sodium chloride, you need to use the formula:
Number of formula units = (mass of substance)/(molar mass of substance)
First, let's find the molar mass of sodium chloride (NaCl). Since sodium (Na) has a molar mass of 22.99 g/mol and chlorine (Cl) has a molar mass of 35.45 g/mol, the molar mass of sodium chloride is:
Molar mass of NaCl = 22.99g/mol + 35.45g/mol = 58.44g/mol
Now you can calculate the number of formula units:
Number of formula units = (292.5g)/(58.44g/mol) = 5 moles
Since 1 mole of substance contains Avogadro's number (6.022 x 10^23) formula units, you can multiply the number of moles by Avogadro's number:
Number of formula units = 5 moles x (6.022 x 10^23 formula units/mol)
Simplifying the calculation:
Number of formula units = 3.011 x 10^24 formula units
Therefore, there are approximately 3.011 x 10^24 formula units in 292.5g of sodium chloride.