Question

A compound is made up of two elements a and b has a=70

Answer 1

Answer:

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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: