What is the mass, in g, of one molecule of ethane, \({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)?

A.     \(3.0 \times {10^{ - 23}}\)

B.     \(5.0 \times {10^{ - 23}}\)

C.     30

D.     \(1.8 \times {10^{25}}\)

B