How Many Oxygen Atoms are in the Chemical Formula Al(PO4)3

University:
Campbell University
Course:
CHEM 111 | General Chemistry I
Academic year:

2024
Views:

408

Pages:

2
Author:

Lily Callahan

Chemical Formulas Rule #1: When looking at a chemical formula, the subscript numbers below and to the left of a symbol tell us how many atoms of that particular element are present in that molecule. ex. H₂O: Two Hydrogen atoms and one Oxygen atom per molecule Diagram: [Image of a water molecule with 2 hydrogen atoms and 1 oxygen atom] Rule #2: When brackets appear in a chemical formula it tells us that the molecule is made up of a group of elements that appear more than once. The number below and to the left tells us how many times that group is found in that molecule. ex. Al(OH)₃: One Aluminum atom, three Oxygen atoms and three Hydrogen atoms per molecule Diagram: [Image of an aluminum hydroxide molecule with 1 aluminum atom, 3 oxygen atoms, and 3 hydrogen atoms] Give the meaning (explain what atoms would be found in such a molecule) for each of the following chemical formulas: a) PbS: ONE LEAD ATOM AND ONE SULPHUR ATOM PER MOLECULE b) KNO₃: ONE POTASSIUM ATOM AND ONE NITROGEN ATOM AND THREE OXYGEN ATOMS PER MOLECULE c) NaOH: ONE ATOM OF SODIUM AND ONE ATOM OF OXYGEN AND ONE ATOM OF HYDROGEN PER MOLECULE d) H₂O: TWO HYDROGEN ATOMS AND ONE OXYGEN ATOM PER MOLECULE e) C₁₀H₈: TEN CARBON ATOMS AND EIGHT HYDROGEN ATOMS PER MOLECULE f) H₂O₂: TWO HYDROGEN ATOMS AND TWO OXYGEN ATOMS PER MOLECULE g) CuSO₄: ONE COPPER ATOM, ONE SULFUR ATOM, AND FOUR OXYGEN ATOMS PER MOLECULE h) Fe₂O₃: TWO IRON ATOMS AND THREE OXYGEN ATOMS PER MOLECULE i) C₂H₅OH: TWO CARBON ATOMS, SIX HYDROGEN ATOMS, AND ONE OXYGEN ATOM PER MOLECULE j) Ca(OH)₂: ONE CALCIUM ATOM, TWO OXYGEN ATOMS, AND TWO HYDROGEN ATOMS PER MOLECULE k) Al₂(SO₄)₃: TWO ALUMINUM ATOMS, THREE SULFUR ATOMS, AND TWELVE OXYGEN ATOMS PER MOLECULE l) Cu(OH)₂: ONE COPPER ATOM, TWO OXYGEN ATOMS, AND TWO HYDROGEN ATOMS PER MOLECULE m) Zn₃(PO₄)₂: THREE ZINC ATOMS, TWO PHOSPHORUS ATOMS, AND EIGHT OXYGEN ATOMS PER MOLECULE n) Fe₂(SO₄)₃: TWO IRON ATOMS, THREE SULFUR ATOMS, AND TWELVE OXYGEN ATOMS PER MOLECULE o) Cu(ClO₃)₂: ONE COPPER ATOM, TWO CHLORINE ATOMS, AND SIX OXYGEN ATOMS PER MOLECULE