Final answer:
To determine the number of molecules in 0.84 moles of CuO, we use Avogadro's number. The number of molecules is 5.051 x 10^23 molecules.
Step-by-step explanation:
To determine the number of molecules in 0.84 moles of CuO, we need to use Avogadro's number. Avogadro's number is defined as 6.022 x 10^23 and represents the number of atoms or molecules in one mole of a substance. First, we need to calculate the number of moles of CuO using the given amount: 0.84 moles. Then, we can multiply this value by Avogadro's number to find the number of molecules:
Number of molecules = 0.84 moles x (6.022 x 10^23 molecules/mole)
Number of molecules = 5.051 x 10^23 molecules
Learn more about Calculating molecules in a given amount of substance