How many seconds will it take light to travel 18.61 km? c = 299792458 meters/second. Report the result with four…

How many seconds will it take light to travel 18.61 km? c = 299792458 meters/second. Report the result with four significant figures in exponential notation

Explain the type of compound aluminum sulfide is (molecular, ionic, acid, base, hydrate) and give the formula. Explain how you obtain it. Submit your report via email 
so that it is