Molar Mass Chemistry Example 2

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Example 2

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What mass of calcium chloride (CaCl2\text{CaCl}_2) contains 0.750.75 mol? (Ca = 40.08, Cl = 35.45 g/mol)

Solution

  1. 1
    Find the molar mass first: M(CaCl2)=40.08+2(35.45)=110.98 g/molM(\text{CaCl}_2) = 40.08 + 2(35.45) = 110.98\,\text{g/mol}.
  2. 2
    Use the moles-to-mass formula m=n×Mm = n \times M and substitute n=0.75 moln = 0.75\,\text{mol}.
  3. 3
    Calculate the mass: m=0.75×110.98=83.24 gm = 0.75 \times 110.98 = 83.24\,\text{g}, so the sample has about 83.2 g83.2\,\text{g} of CaCl2\text{CaCl}_2.

Answer

83.2 g of CaCl283.2\,\text{g of CaCl}_2
The molar mass serves as a conversion factor between moles and grams: multiply moles by molar mass to get grams, divide grams by molar mass to get moles.

About Molar Mass

The mass in grams of exactly one mole of a substance, calculated by summing the atomic masses of all atoms in the chemical formula.

Learn more about Molar Mass →

More Molar Mass Examples

Example 1 easy

Calculate the molar mass of glucose ([formula]).

Example 3 easy

Calculate the molar mass of sulfuric acid ([formula]). (H = 1.008, S = 32.07, O = 16.00)

Example 4 easy

What mass of calcium carbonate ([formula]) is equal to [formula] mol? (Ca = [formula], C = [formula]

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