I am trying to find the mass of my compound, but Im not sure if its 76 or 173 bc Im not sure if those smaller number are just indicating that there are peaks there that cant be seen?

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A: The Answer & The Explanation is shown below:

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A: This question belongs to Electrochemistry. As per guideline I can answer upto option C.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.