An oxide of a metal -M- contains 40- by mass of oxygen- Metal -M- has atomic mass of 24-The empirical formula of the oxide is -M-2-OMO-M-2-O-3-M-3-O-4-

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An oxide of a metal -M- contains 40-xA0- by mass of oxygen-

An oxide of a metal (M) contains $40$ % by mass of oxygen. Metal (M) has atomic mass of $24$ .The empirical formula of the oxide is :
$M_{2} O$
$M O$
$M_{2} O_{3}$
$M_{3} O_{4}$

An oxide of a metal (M) contains $40 %$ by mass of oxygen.

An oxide of a metal (M) contains 40% by mass of oxygen. Metal (M) has atomic mass of 24.The empirical formula of the oxide is :M2OMOM2O3M3O4

An oxide of a metal (M) contains 40 % by mass of oxygen.

An oxide of a metal (M) contains $40$ % by mass of oxygen. Metal (M) has atomic mass of $24$ .The empirical formula of the oxide is :
$M_{2} O$
$M O$
$M_{2} O_{3}$
$M_{3} O_{4}$

An oxide of a metal (M) contains $40 %$ by mass of oxygen.