How much positive charge is contained in 3 moles of argon? (Given: Avogadro's number, NA = 6.022 x 10^23 mol^-1, elementary charge, e = 1.60 x 10^-19 C)
a) 2.88 x 10^23 C
b) 4.80 x 10^23 C
c) 9.60 x 10^23 C
d) 1.44 x 10^24 C