Question

Determine the number of molecules in 3.79 kilograms of the fictional compound Cs7(Cr5O3)4. Include the units, but do not write the chemical formula. Round the answer to 3 significant figures.

Answer 1

1.0555 * 10^24 molecules

Step-by-step explanation:

Number of molecules = ?

Mass = 3.79 Kg = 3790 g

Molar mass of Cs7(Cr5O3)4 = 2162.25 g/mol

Number of moles = Mass / Molar mass

Number of moles = 3790 g / 2162.25 g/mol

Number of moles = 1.7528 mol

1 mol = 6.022 * 10^23 molecules

1.7528 mol = x

solving for x;

x = 6.022 * 10^23 * 1.7528

x = 1.0555 * 10^24 molecules