Nis3h6treyHelpwi
contestada

On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69Ga and 39.71% for 71Ga . What is the atomic mass of gallium for this location?
The mass of 69Ga is 68.7200amu . The mass of 71Ga is 70.9200amu .

Respuesta :

Hagrid
To solve this, we multiply the each mass of the isotope by the percentage of abundance of each isotope. 

average molecular weight = 0.6129(68.72amu) + 0.3971(70.92) = 70.28 amu