How many grams of aluminum chloride are produced from 34.0 g of aluminum and 39.0 g of chlorine gas?

First, you would need to find the chemical formula for aluminum chloride. Becuase aluminum is  and chloride is , your equation would be Al

The chemical formula tells us how much of each element is in the compound. Because we now know that there is one aluminums and 3 chlorides, multiply Al by 34.0 g once and Cl by 39.0 g three times. 34.0g + 3( 39.0g). Your answer turns out to be 151 g Al

Hope this helps!