Molar Mass and Percent Composition

Find the percentage composition of Mg in Mg₃(PO₄)₂.

• 27.48% Mg

• 43.11% Mg

• 16.00% Mg

• 12.63% Mg

What is the molar mass of CO₂?

• 12 g/mol

• 16 g/mol

• 32 g/mol

• 44 g/mol

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

What are the units in molar mass?

• grams
• moles
• moles/gram
• grams/mole

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
  

Tags

NGSS.MS-PS1-1

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

The mass % of H in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

• 6%

Gallium nitride (GaN) is an important material in computer chips. What is the percent composition of gallium in gallium nitride?

• 83%

• 17%

• 100%

• 0.8327

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

Tags

NGSS.MS-PS1-1

Calculate the molar mass of Cu₂O.

• 37 g/mol

• 45 g/mol

• 79.5 g/mol

• 143 g/mol