<span>"President Johnson's escalation of the Vietnam War after the Tonkin Gulf Incident" is the historical event most useful to include in a speech regarding power in the executive branch.</span>
<span>Molar Mass
Gas A 53.8% Nitrogen
462% Carbon
53.8 N/14 = 3.84
46.2 C/12 = 3.85
So since these are identical, and there is no hydrogen (which eradicates HCN as a possibility) we are going to cut to the chase and say since its empirical formula must be CN, the molecular formula is (CN)2, or Cyanogen.
So it gives MW = 52</span>
The historical figure that needs to be researched is Eugene Debs. Thus, the answer is letter C. He was the Socialist Party's candidate for president last 1920. He campaigned from a prison cell. The party worked hard for disarmament and prevention of war.