4.00 mol of a hydrocarbon with an empirical formula of ${\text{C}}{{\text{H}}_{\text{2}}}$ has a mass of 280 g. What is the molecular formula of this compound?

A.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}$

B.     ${{\text{C}}_{\text{3}}}{{\text{H}}_{\text{6}}}$

C.     ${{\text{C}}_{\text{4}}}{{\text{H}}_{\text{8}}}$

D.     ${{\text{C}}_{\text{5}}}{{\text{H}}_{{\text{10}}}}$

D