Answer:
Step-by-step explanation:
The number of grams of Aluminum in one mole of Aluminum is the number under the element's symbol, on the Periodic Table of the elements, which is 26.981. With compounds, water, for example, is an oxygen and two hydrogens. So you would add 15.999 to 2(1.0079). You multiply the hydrogen's number by two because there's two of them.