It seems like you're asking for how to calculate the formula of a compound or determine its relative atomic masses and the nucleon number (which is the sum of protons and neutrons in an atom).
The percentage by mass of any element is calculated with the help of?
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This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.