The molar mass of M is 0.225g/mol and the element M is Hydrogen
If a metal M combines with an oxygen element to form the oxide, [tex]M_2O[/tex] then the chemical reaction will be expressed as:
[tex]4M + O_2 -> 2M_2O\\[/tex]
This shows that 4 moles of an unknown element M react with the oxygen element to produce the oxide [tex]M_2O[/tex]
Given the following parameters
Mass of M = 0.890 grams
Mass of [tex]M_2O[/tex] = 0.956 grams
Get the molar mass of M:
Molar mass = Mass/number of moles
Molar mass = 0.890/4
Molar mass = 0.225g/mol
Hence the molar mass of M is 0.225g/mol and the element M is Hydrogen
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