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ChemistryGeneral Chemistry

How Many Hydrogen Atoms Are in 0.1488 g of Phosphoric Acid?

The 0.1488 g sample contains 1.518 × 10⁻³ mol H₃PO₄. Multiplying by three hydrogen atoms per molecule and Avogadro’s constant gives 2.743 × 10²¹ H atoms.

Question

How many hydrogen atoms are in 0.1488 g0.1488\,\mathrm g of phosphoric acid, H3PO4\mathrm{H_3PO_4}?

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Evidence boundary

The calculation assumes a pure, neutral, anhydrous H₃PO₄ sample and uses average atomic weights plus the exact Avogadro constant. It counts all H atoms represented by the formula; it is not a count of dissociated H⁺ ions in solution or of a particular hydrogen isotope. The result is rounded to four significant figures.