2. Atoms & Elements

What is the primary purpose of determining the formula (molar) mass of a compound?

Given a 0.125 g sample of copper(II) sulfate (CuSO4), how many moles of CuSO4 are present? (Molar mass of CuSO4 = 159.6 g/mol)

How many total atoms are present in one formula unit of Al_2(CO_3)_3?

What is the mass (in grams) of a single molecule of CCl_4?

What is the mass of 4 moles of helium (He)?

What is the molar mass of sodium chloride (NaCl)?

Which of the following statements correctly describes the formula weight (molar mass) of a compound?

What is the molar mass of sodium chloride (NaCl)?

What is the mass (in grams) of 1.27 mol of water (H_2O)?

How many total valence electrons are present in a molecule of CCl_4?

How many oxygen atoms are present in one formula unit of Mg(OH)_2?

How many hydrogen atoms are present in three formula units of ammonium benzoate, C6H5COONH4?

Use the data in the table to calculate the atomic mass of silicon.

Exact Mass and Abundance of 3 Isotopes of Silicon

Isotope	Isotopic Mass	Abundance
28Si	27.97693 amu	92.23%
29Si	28.97649 amu	4.67%
30Si	29.97376 amu	3.10%

What is the mass (in grams) of 3.99 moles of krypton (Kr)?

Which conversion factor should you use to convert moles of sodium (Na) to the mass of sodium?