8. An unknown compound is decomposed into 40.1 gm of Ca and 159.8 gr 6 poins of Br. What is its empirical formula? Hint: Convert the grams to moles*
O A. CaBr
O B. Ca, Br
Ос. Саве,
O D. Ca Br,

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

At element makes up all organic compounds?