a molecule X3 has a mass of 48amu . What is the atomic mass of X
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100 g MH3 contains 90 g M and 10 g H.
10 g H = 10 mol H
The number of mols M in the sample is one-third the number of mols H. Therefore, the sample contains 3.33… mol M.
90 g M/3.33 mol M = 27 g M/mol
M is aluminum.
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