100 POINTS - A sample of crushed rock is found to have 4.81 x10^21 atoms of gold, how many moles of gold are present in this sample? SHOW WORK INCLUDING FORMULA : THANK YOU

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Classify this reaction: 2al+n2-> aln.

Which statement best describes the he properties of iconic compounds ?