Answer:
15.28 moles
Explanation:
E = nR(T2 - T1)
E is the heat added = 8130 J
R is the gas constant = 8.314 J/mol.K
T2 is the final temperature of the gas = 285 K
T1 is the initial temperature of the gas = 221 K
8130 = n×8.314(285 - 221)
n = 8130/8.314×64 = 8130/532.096 = 15.28 moles