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Chemistry Asked by a SnapAndSolve user · about 2 hours ago

Examples of Molecular Mass and Formula Mass Calculations Determine the molecular or formula mass from the...

Examples of Molecular Mass and Formula Mass Calculations
Determine the molecular or formula mass from the following in units of grams/mole:
Name Particle type Element count
1) Br₂
2) NO₂
3) Mo₂(C₂H₃O₂)₄
4) PO₄⁻³
5) H₂CrO₄
6) Na₂B₄O₇·10H₂O
7) Ti(SO₄)₂·6H₂O
8) Ag

Answer

  1. Br₂: Particle type: molecule. Element count: Br = 2. Molar mass = 2(79.904) = 159.81 g/mol.

  2. NO₂: Particle type: molecule. Element count: N = 1, O = 2. Molar mass = 14.007 + 2(15.999) = 46.01 g/mol.

  3. Mo₂(C₂H₃O₂)₄: Particle type: molecule. Element count: Mo = 2, C = 8, H = 12, O = 8. Molar mass = 2(95.95) + 8(12.011) + 12(1.008) + 8(15.999) = 428.08 g/mol.

  4. PO₄³⁻: Particle type: polyatomic ion. Element count: P = 1, O = 4. Molar mass = 30.974 + 4(15.999) = 94.97 g/mol.

  5. H₂CrO₄: Particle type: molecule. Element count: H = 2, Cr = 1, O = 4. Molar mass = 2(1.008) + 51.996 + 4(15.999) = 118.01 g/mol.

  6. Na₂B₄O₇·10H₂O: Particle type: formula unit (ionic hydrate). Element count: Na = 2, B = 4, O = 17, H = 20. Molar mass = 2(22.990) + 4(10.81) + 17(15.999) + 20(1.008) = 381.36 g/mol.

  7. Ti(SO₄)₂·6H₂O: Particle type: formula unit (ionic hydrate). Element count: Ti = 1, S = 2, O = 14, H = 12. Molar mass = 47.867 + 2(32.06) + 14(15.999) + 12(1.008) = 348.07 g/mol.

  8. Ag: Particle type: atom. Element count: Ag = 1. Molar mass = 107.87 g/mol.

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