Chemical formulas point to the ratios of the different types of atoms in a compound. Percentage composition indicates the relative masses of each element in a compound. Mass ratios are important for lab work, while atomic ratios are important for understanding chemical reactions.
A certain ionic compound is made entirely of aluminum and oxygen.
A) Explain what is the formula for this compound?
Express your answer using chemical symbols and subscripted numbers.
B) Find out the composition percentage by mass of each element in the compound.
Type the percentage of Al followed by the percentage of O separated by a comma. For instance type 20, 80 if the compound is 20 percent aluminum as well as 80 percent oxygen. Don't enter a percent sign.