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Formula Weight

Formula Weight. Formula Weight is the total mass of a compound. FW = SUM(Atomic Mass x # of the Element). Calculating the Formula Weight of H 2 SO 4. Step 1: Break the formula down into the elements that make it up. H S O. Calculating the Formula Weight of H 2 SO 4.

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Formula Weight

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  1. Formula Weight

  2. Formula Weight is the total mass of a compound.FW = SUM(Atomic Mass x # of the Element)

  3. Calculating the Formula Weight of H2SO4 Step 1: Break the formula down into the elements that make it up. H S O

  4. Calculating the Formula Weight of H2SO4 Step 2: Place the number of each element that make the compound. H: 2 S: 1 O: 4

  5. Calculating the Formula Weight of H2SO4 Step 3: Multiply each number by the Atomic Mass for each element. The mass should be rounded to the nearest whole number. H: 2 x 1 = 2 S: 1 x 32 = 32 O: 4 x 16 = 64

  6. Calculating the Formula Weight of H2SO4 Step 4: Total the mass for all the elements. H: 2 x 1 = 2 S: 1 x 32 = 32 O: 4 x 16 = 64 98

  7. Calculating the Formula Weight of H2SO4 FW for H2SO4 = 98 amu

  8. Calculating the FW of Ca(OH)2 Ca: O: H:

  9. Calculating the FW of Ca(OH)2 Ca: 1 O: 2 H: 2

  10. Calculating the FW of Ca(OH)2 Ca: 1 x 40 O: 2 x 16 H: 2 x 1

  11. Calculating the FW of Ca(OH)2 Ca: 1 x 40 = 40 O: 2 x 16 = 32 H: 2 x 1 = 2

  12. Calculating the Formula Weight of Ca(OH)2 Ca: 1 x 40 = 40 O: 2 x 16 = 32 H: 2 x 1 = 2 =74

  13. Calculating the Formula Weight of Ca(OH)2 FW for Ca(OH)2 = 74 amu

  14. Calculate the formula weight for the compound CaCl2.

  15. Calculate the formula weight for the compound CaCl2. Ca: 1 x 40 = 40 Cl: 2 x 35 = 70 =110 F.W.=110 amu

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