A compound is made up of two elements a and b has a=70
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your question is incompelete , well i've understood what must be your question
Relative number of moles of an element = % of element / atomic mass
or atomic mass = % of element / relative number of moles
Atomic mass of A = 70 / 125 = 56
and atomic mass of B = 30 / 1.88 = 16
empirical formula = $A_{2}$$B_{3}$
calculation of molecular formula
empirical formula mass = 2*56 + 3 *16 = 160
n = molecular mass / empirical formula = 160/160 = 1
Molecular formula = $A_{2}$$B_{3}$
Explanation:
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