A heating-cooling system cycles gases between states. Assume this system is using 1.00 moles of an ideal gas with a C(v) = 25.00 J/mol:
K. In this cycle, the gas was cooled from 561.0 K to 392.0 K. In
addition, the pressure changed from 20.0 atm to 14.0 atm while the
volume remained constant. Calculate AE, in J, for this process.
4
7
+/-

answer; i believe that the correct answer is (a) potassium(k)

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.