B. Calculate the Pressure of 20.0 mole of helium in a 10.0 L cylinder at 273 K. [a = 0.0341 atm*L^2/mol^2 ; b = 0.0237L/mol ; R = 0.08205 L*atm/mol*K) * 87.3 atm
46.9 atm
55.5 atm
12 kPa

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.

i dont know

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current