Question

jenny wanted to make 3 molecules of a substance made with aluminum and oxygen. how many aluminum and oxygen atoms will she need? a 1 aluminum; 1 oxygen b 2 aluminum; 3 oxygen c 3 aluminum; 6 oxygen d 6 aluminum; 9 oxygen

Explanation:

Step1: Identify compound formula

The compound of aluminum and oxygen is $Al_2O_3$. One molecule of $Al_2O_3$ has 2 aluminum and 3 oxygen atoms.

Step2: Calculate for 3 molecules

For 3 molecules of $Al_2O_3$, the number of aluminum atoms is $3\times2 = 6$ and the number of oxygen atoms is $3\times3=9$.

Answer:

D. 6 aluminum; 9 oxygen