An oxide of aluminum contains 0.545 g of Al and 0.485 g of O. Find the empirical formula
for the oxide.

The answer is: Al2O3

Explanation:

The data they give us is:

To find the empirical formula without knowing the grams of the compound, we find it per mole:

Then we must divide the results obtained by the lowest result, which in this case is 0.02:

Since both numbers have to give an integer, multiply by 2 until both remain integers:

Now the answer is given correctly:

first one is the correct answer

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.