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Normally, a chemical formula is written with whole numbers – implying a distinct stoichiometry. In the...

Normally, a chemical formula is written with whole numbers – implying a distinct stoichiometry. In the paper, the formula for the series of compounds is written as YIn1-xMnxO3. Why? How does one interpret the meaning of a specific composition such as YIn0.9Mn0.1O3 as it is not possible to have 1/10 of a Mn atom?

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Answer #1

If a chemical fromula has any decimal number in it, then we have to convert it into nearest whole number by multiplying some number.

Ex- If the formula is written as-

YIn0.9Mn0.1O3

Then that means mols of Y present = 1

mols of In present = 0.9

mols of Mn present = 0.1

mols of O present = 3

Now since we can't have a fraction as the number of moles, to convert it into a whole number, lets multiply 10 in all the atoms. i.e

10 * (YIn0.9Mn0.1O3) = Y(1*10) In(0.9*10)Mn(0.1*10)O(3*10)   

So our molecular fromula will be =  Y10 In9Mn1O30

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