Final answer:
The quantity of moles in 4.21 x 10²³ molecules of CaCl₂ is determined by dividing the number of molecules by Avogadro's number (6.022 x 10²³), resulting in approximately 0.699 moles of calcium chloride.
Step-by-step explanation:
To determine the quantity of moles in 4.21 x 10²³ molecules of CaCl₂, we need to use Avogadro's number, which is 6.022 x 10²³ molecules per mole. This constant allows us to convert molecules to moles. Mole is defined as the ratio of the mass of a given compound to the molar mass of the compound..
First, we set up the conversion using Avogadro's number: Number of moles = (Number of molecules) ÷ (Avogadro's number). Next, we substitute the given number of molecules into the equation: Number of moles = (4.21 x 10²³) ÷ (6.022 x 10²³).
Now, we calculate the number of moles: Number of moles = 0.699 moles of CaCl₂. The calculated quantity of moles is approximately 0.699 moles of calcium chloride.