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3 Calculating Molar Mass

Last updated about 1 month ago
10 questions
Note from the author:

Big Ideas

  • In this lesson we will learn how to find the molar mass of an element or compound!
  • The molar mass tells you the mass of one mole of a substance.
  • For pure, monatomic elements, the molar mass is equal to the relative atomic mass.
  • For compounds, the molar mass can be calculated by adding up the relative atomic masses of each of the atoms in the compound.
  • In the periodic table, the relative atomic mass is the small number at the bottom of the element square.

Tips

  • If there is a subscript in a compound indicating that there are multiple atoms of a given element, don't forget to multiply the relative atomic mass of that element by that number!

Big Ideas

  • In this lesson we will learn how to find the molar mass of an element or compound!
  • The molar mass tells you the mass of one mole of a substance.
  • For pure, monatomic elements, the molar mass is equal to the relative atomic mass.
  • For compounds, the molar mass can be calculated by adding up the relative atomic masses of each of the atoms in the compound.
  • In the periodic table, the relative atomic mass is the small number at the bottom of the element square.

Tips

  • If there is a subscript in a compound indicating that there are multiple atoms of a given element, don't forget to multiply the relative atomic mass of that element by that number!
As a reminder, use the image to identify the atomic mass for an element.

Please round your answer to the nearest whole number (no decimals) & include units (g/mol).
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1

Manganese has the symbol Mn. What is the molar mass of manganese?

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1

Tungsten has the symbol W. What is the molar mass of tungsten?

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1

Diatomic hydrogen has the formula, H2. What is the molar mass of H2?

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1

Diatomic chlorine has the formula, Cl2. What is the molar mass of Cl2?

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1

Ammonia has the formula, NH3. What is the molar mass of NH3?

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1

Cycloheptane has the formula, C7H14. What is the molar mass of C7H14?

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1

Aluminum bromide has the formula, AlBr3. What is the molar mass of AlBr3?

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1

Rubidium oxide has the formula, Rb2O. What is the molar mass of Rb2O?

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1

Strontium phosphide has the formula, Sr3P2. What is the molar mass of Sr3P2?

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1

Cesium chloride has the formula, CsCl. What is the molar mass of CsCl?