Apollo 9 launched in 1969. Its mission was to test the
lunar model, the part of the space vehicle that would
take the astronauts to the moon. The astronauts in the
lunar module tested its engines and equipment while
they orbited Earth.
Which specific NASA goal did Apollo 9's mission focus
on?

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"

D=m/v =57.9/3 = 19.3 g/cm^3

Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).