Final answer:
To determine the number of chloride atoms provided by a sample of chromium (III) chloride hexahydrate, you need to calculate the molar mass of chromium chloride hexahydrate and the molar mass of chloride. Then, divide the mass of the sample by the molar mass of chromium chloride hexahydrate, and multiply by Avogadro's number to find the number of chloride atoms.
Step-by-step explanation:
To determine how many chloride atoms are provided by a 0.570 g sample of chromium (III) chloride hexahydrate, we need to know the molar mass of chromium chloride hexahydrate and the molar mass of chloride. The molar mass of chromium chloride hexahydrate is calculated as the sum of the molar masses of its constituent elements: chromium (Cr), chlorine (Cl), and water (H2O). The molar mass of chloride is the molar mass of one chloride ion.
First, calculate the molar mass of chromium chloride hexahydrate:
Molar mass of CrCl3·6H2O = (Molar mass of Cr) + (3 x Molar mass of Cl) + (6 x Molar mass of H2O)
Next, calculate the molar mass of chloride:
Molar mass of Cl = Atomic mass of Cl
To find the number of chloride atoms provided, divide the mass of the sample by the molar mass of chromium chloride hexahydrate, and multiply by Avogadro's number:
Number of chloride atoms = (Mass of sample / Molar mass of CrCl3·6H2O) x Avogadro's number