Chemistry

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 atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

The number 6.02 x 10²³ is called...

• Obama's number
• Bohr's number
• Trump's number
• Avogadro's number

Tags

NGSS.HS-PS1-7

How many particles would be in 8.4 moles of Octane (C₈H₁₈)?

• 5.77 x 10²³
• 5.04 x 10²⁴
• 5.77 x 10²⁶
• 5.04 x 10²³

Which has more molecules?

• 1 mole H₂O
• 1 mole Al(OH)₃
• 1 mole NaCl
• There are all the same

What is the mole used for? 

• To measure the amount of grams in a substance
• To measure the amount of atoms or molecules in a substance
• To measure the amount of energy in a substance
• To measure the amount of bonding in a substance 

Tags

NGSS.HS-PS1-7

How many molecules are there in 5.5 moles potassium chloride?

• 4.08 x 10^-24

• 3.31 x 10²⁴

• 33.11

• 0.98

How many students are there in 31.8 moles of students?

• 5.28 x 10^-23 students
• 1.91 x 10²⁵ students
• 5.28x 10-²⁵  students
• 1.91 x 10²² students

How many moles are 2.85 x 10²⁰ atoms of iron?

• 4.73 x 10^-4 moles
• 1.72 x 10⁴ moles
• 1.72 x 10^-42 moles
• 4.73 x 10⁴ moles

How many moles of copper are 4.57 x 10¹⁵ atoms of copper?

• 7.59 x 10^-9 moles
• 2.75 x 10^-33 moles
• 7.59 x 10⁹ moles
• 2.75 x 10³³ moles