Oxygen molecule is ______ times heavier than Helium molecule? (A) 2 (B) 4 (C) 8 (D) 16

1 Answer
Truong-Son N.
Jul 25, 2017

Well, helium molecule , #"He"_2#, doesn't exist for any appreciable amount of time, but helium atom, #"He"#, does...

And helium atom has the atomic mass #"4.0026 g/mol"#, while oxygen molecule has the molecular mass #"31.998 g/mol"#.

Hence, oxygen molecule is about #8# times as MASSIVE, and under the same gravitational field, is about #8# times as heavy.

#vecF_g(He) = m_(He)vecg#

#vecF_g(O_2) = m_(O_2)vecg#

#=> (vecF_g(O_2))/(vecF_g(He)) = m_(O_2)/(m_(He)) ~~ 8#

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