Final answer:
To determine the number of molecules in 86 g of CCl4, calculate the molar mass of CCl4, convert grams to moles, and then use Avogadro's number to find that there are approximately 3.37 × 1023 molecules of CCl4.
Step-by-step explanation:
To calculate how many molecules are in 86 g of CCl4, we must first find the molar mass of CCl4. Carbon (C) has an atomic mass of about 12.01 g/mol and chlorine (Cl) has an atomic mass of about 35.45 g/mol.
Since CCl4 contains one carbon atom and four chlorine atoms, its molar mass is 12.01 g/mol + (4 × 35.45 g/mol) = 153.81 g/mol.
Next, we convert the 86 g of CCl4 to moles using the molar mass:
86 g CCl4 × (1 mol CCl4 / 153.81 g CCl4) = 0.56 moles of CCl4.
Finally, we use Avogadro's number, which is 6.022 × 1023 molecules/mol, to find the number of molecules in 0.56 moles of CCl4:
0.56 mol × (6.022 × 1023 molecules/mol) = 3.37 × 1023 molecules of CCl4.