The mole is the SI unit for the amount of substance, defined as containing as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. For elements, the molar mass in grams per mole is numerically equal to the atomic mass in atomic mass units (amu).
What is the number of moles of 'He' in 104 g of helium gas ?
Asked in UPSC CDS 1 2022 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
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