Question

how many molecules of lithium chloride are in 78.40 g? the molar mass of lithium chloride is 42.39 gmol.

Answer 1

To find the number of molecules of lithium chloride in 78.40 g, we need to first convert the mass to moles using the molar mass of lithium chloride:

moles = mass / molar mass

moles = 78.40 g / 42.39 g/mol

moles = 1.849 mol

Now we can use Avogadro's number to convert from moles to molecules:

molecules = moles x Avogadro's number

molecules = 1.849 mol x 6.022 x 10^23 molecules/mol

molecules = 1.111 x 10^24 molecules

Therefore, there are 1.111 x 10^24 molecules of lithium chloride in 78.40 g.

Step-by-step explanation: