chem final review

What is the molar mass of NaOH?

• 40.0 g/mol

• 38.9 g/mol

• 23.9 g/mol

• 57.0 g/mol

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

What is the molar mass of B₂(CO₃)₃?

• 81.632 g/mol

• 94.842 g/mol

• 38.822 g/mol

• 201.648 g/mol

How many moles are in 19.82 g Mg? HINT: You will need the molar mass of Magnesium.

• 1.226 mol Mg

• 481.7 mol Mg

• 1.000 mol Mg

• 0.8156 mol Mg

Calculate the mass of 5.0 mol of iron. HINT: You will need the molar mass of Iron.

• 8.3 x 10^-24 g

• 0.090 g

• 3.0 x 10²⁴ g

• 280 g

How many moles are in 16.94g of water? HINT: You will need the molar mass of H₂O.

• 16.94 mol H₂O

• 0.9401 mol H₂O

• 305.3 mol H₂O

• 1.063 mol H₂O

What is the molar mass of CO₂?

• 12 g/mol

• 16 g/mol

• 32 g/mol

• 44 g/mol

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

• Mg : 1--NO :  6
  
• Mg : 1-- N :  6--O:  6
  
• Mg :  1-- N:   1--  O: 5
  
• Mg :  1-- N: 2--  O: 6
  

Which list of number of atoms in MgF₂ is right?

• Mg : 1--  F :  1
  
• Mg : 1 -- F :  2
  
• Mg :  2 --  F :   1
  
• Mg : 0 --   F :  1
  

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