Answer:
To determine how many molecules of Magnesium Chloride Courtney has:
1. Determine the molar mass of Magnesium Chloride (MgCl2): MgCl2 = (24.305 + 35.453 * 2) = 95.211 g/mol.
2. Divide the given mass (350 g) by the calculated molar mass (95.211 g/mol): 350/95.211 = 3.681 mol.
3. Find the number of molecules by multiplying the moles (3.681 mol) by Avogadro’s number (6.022 x 10^23): 3.681 x 6.022 x 10^23 = 22.162 x 10^23 molecules.
4. Courtney has 22.162 x 10^23 molecules of Magnesium Chloride.