Chapter 7.2 Review Regular

What is the molar mass of sodium?

• 11
• 22.990
• 45.98
• 3

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

A chemical formula that shows the actual # of atoms present in a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

A scientist shows you a 2.25-mol sample of carbon and a 2.25-mol sample of selenium.  Which of the following is true?

• they have the same mass
• they have the same volume
• they have the name number of atoms
• they have the same density

Which list of number for the atoms in Mg(NO₃)₂ is right?

• Mg = 1, N = 6,  O =  6
  
• Mg = 1, N = 6,  O =  2
• Mg = 2, N = 2,  O =  6
• Mg = 1, N = 2,  O =  6

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

How many moles is 4 grams of Calcium?

• 0.10 moles
• 10 moles
• 44 moles
• 160 moles