Final answer:
To calculate the number of molecules of AsCl₃ in 1 mL of solution C, you need to determine the molar concentration of the solution. Once the concentration is known, you can convert the volume to liters and use Avogadro's number to calculate the number of molecules.
Step-by-step explanation:
To calculate the number of molecules of AsCl₃ that would be in 1 mL of solution C at this concentration, we first need to determine the molar concentration of solution C. Let's assume the concentration is given in moles per liter (M).
The molar mass of AsCl₃ is 181.28 g/mol. If the concentration is given as 0.629 M, this means that for every liter of solution, there are 0.629 moles of AsCl3 present.
Now, since we have 1 mL of solution, we need to convert mL to liters. There are 1000 mL in 1 L, so 1 mL is equal to 0.001 L.
Finally, we can calculate the number of molecules of AsCl₃ by multiplying the molar concentration by Avogadro's number (6.022 × 10²³ molecules/mol):
Number of molecules = 0.629 mol/L × 6.022 × 10²³ molecules/mol × 0.001 L = 3.774 × 10²⁰ molecules of AsCl3