How many c-13 atoms are present, on average, in a 23000-atom sample of carbon?

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.