Percent Composition and Molar Mass

How to calculate molar mass of H₂O?

• 2+16=18
• 1+16=17
• 2+32=34
• 1+31=32

What is the molar mass of CO₂?

• 12 g/mol

• 16 g/mol

• 32 g/mol

• 44 g/mol

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 table salt (NaCl)?

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

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

What is the mass percentage of Carbon in Carbon dioxide (CO₂)?

• 27.27%

• 42.86%

• 72.73%

• 72.72%

What are the units in molar mass?

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

Find the molar mass of KCl

• 36 g/mol
• 78 g/mol
• 74 g/mol
• 178 g/mol

What is the molar mass of fluorine gas, F₂?

• 18.998 g/mol
• 38 g/mol
• 9 g/mol
• 18 g/mol

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
  

Tags

NGSS.MS-PS1-1