Question

In chemistry experiment it is determined that 4.2 moles of aluminum oxide are needed to completely react with a sample of sodium. How many molecules of aluminum oxide are there in 4.2 moles? After an experiment, 35.6 g of carbon were recovered. How many moles of carbon is this?

Answer 1

Aluminium Oxide = 2.5×10²³ molecules

Carbon = 2.96 moles

Step-by-step explanation:

1 mole of aluminium oxide contains 6.02× 10²³ molecules, hence 4.2 moles will contain 4.2 ×6.02×10²³ molecules

for carbon, number of moles = Mass/ Molar Mass = 35.6/12.01 = 2.96 mole