Silicon has a density of 2.33 g/cm^3 and an atomic mass of 28.09 g/mol. A 0.2-mm thick wafer is treated so that a uniform concentration gradient of antimony is produced. One surface contains 10 Sb atom per 10^8 Si atoms and the other surface contains 500 Sb atoms per 10^8 Si atoms. Calculate the concentration gradient in Sb atoms/cm^3.cm.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

the maximum mass of nh3 is nh3 in grams