When 6 protons and 6 neutrons fuse to form one nucleus of carbon-12 (12C6), how much mass is lost?
a) 1.64 × 10⁻²⁴ g
b) 3.28 × 10⁻²⁴ g
c) 2.46 × 10⁻²⁴ g
d) 4.92 × 10⁻²⁴ g