How many formula units of lithium iodide,LiI,have a mass equal to 4.24 g?

Question

Quizplus · Accepted Answer

To find the number of formula units in 4.24 g of lithium iodide (LiI), first calculate the molar mass of LiI. Lithium (Li) has an atomic mass of about 6.94 g/mol, and iodine (I) has an atomic mass of about 126.9 g/mol. The molar mass of LiI is therefore 6.94 g/mol + 126.9 g/mol = 133.84 g/mol. The number of moles of LiI in 4.24 g is calculated by dividing the mass by the molar mass: 4.24 g / 133.84 g/mol = 0.0317 mol. The number of formula units in a mole is Avogadro's number, 6.022 x 10^23. Therefore, the number of formula units in 0.0317 mol is 0.0317 mol x 6.022 x 10^23 formula units/mol = 1.91 x 10^22 formula units.

How Many Formula Units of Lithium Iodide,LiI,have a Mass Equal