Moles Review

What is the molar mass of NaCl?

• 58.45g/mol
• 28g/mol
• 12g/mol
• 6.02 x 10²³

What would be the mass of 1.5mol H₂O

• 20
• 27
• 32
• 40

Which list of number of atoms in Mg(NO2)₂ is right?

• Mg : 1--NO :  2
  
• Mg : 1-- N :  6--O:  2
  
• Mg :  1-- N:   1--  O: 2
  
• Mg :  1-- N: 2--  O: 4
  

Tags

NGSS.MS-PS1-1

What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)?

• 24%
• 49%
• 51%
• 65%

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%
• C = 85.7 %
  H = 14.3%
• C = 92.2%
  H = 7.8%
• C = 71.9%
  H = 28.1%

Tags

NGSS.HS-PS1-1

Molar mass of NaOH is ______________________

• 40 grams/mol

• 50 grams/mol

• 45 grams/mol

• 38 grams/nol

In chemistry, a "mole" is:

• The mass of an atom
• a large number used to count particles
• based on the volume of a substance

How many moles of carbon atoms are there in 5g of carbon?

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

Tags

NGSS.HS-PS1-7

How many moles are there in 12.7g of CaF₂?

• 0.20 mol
• 1,000.76 mol
• 6.14 mol
• 0.16 mol

What is the mass of 9.4 moles of B₂(Cr₂O₇)₃?

• 6.41 x 10²²g
• 5.67x10²⁴ g
• 49.11 g
• 4,339.23 g

Tags

NGSS.HS-PS1-7