Final answer:
To determine the number of moles in 4kg of CuO, divide the mass of CuO by its molar mass. There are approximately 50.282 moles in 4kg of CuO.
Step-by-step explanation:
To state the number of moles in 4kg of CuO, we need to use the molar mass of CuO. Copper (II) oxide, or CuO, has a molar mass of approximately 79.55 grams per mole. To find the number of moles, we divide the mass of the compound by its molar mass:
Number of moles = mass of substance / molar mass of substance
In this case:
Number of moles of CuO = 4000 grams / 79.55 g/mol
Number of moles of CuO = 50.282 moles (rounded to 3 decimal places)
Therefore, there are 50.282 moles in 4kg of CuO.