There are three naturally occurring isotopes
of the hypothetical element hilarium 44Hi,
45Hi, and 47Hi. The percentages of these
isotopes are the following:
Hilarium Natural
Isotopes Abundance
44Hi 29.3%
45Hi 35.9%
47Hi 34.8%
You can assume that the atomic masses are
exactly equal to the mass number. Calculate
the weight of “naturally” occurring hilarium
and report it as you would for any other naturally occurring element.
Answer in units of g/mol Your answer must
be within ± 0.005%

Question

There are three naturally occurring isotopes 
 of the hypothetical element hilarium 44Hi, 
 45Hi, and 47Hi. The percentages of these 
 isotopes are the following: 
 Hilarium Natural 
 Isotopes Abundance 
 44Hi 29.3% 
 45Hi 35.9% 
 47Hi 34.8% 
 You can assume that the atomic masses are 
 exactly equal to the mass number. Calculate 
 the weight of “naturally” occurring hilarium 
 and report it as you would for any other naturally occurring element. 
 Answer in units of g/mol Your answer must 
 be within ± 0.005%