Which is an example of a compound idoine water sand gold

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

At element makes up all organic compounds?