Moles and Avogadro's Number

What is the scientific notation for 1,079,000,000,000,000 (Hint, count the number of zeros)

• 1,079x10¹²

• 1.0x10¹⁵

• 1.079x10¹⁹

• 1.079x10¹⁵

How many zinc(II) atoms are in 65.4 grams of zinc (Zn). (Hint: Look at the periodic table for the Molecular Weight of Zinc. Remember that Grams = MW x Moles)

• 10

• 4,277.2

• 6.02x10²³

• 130.8

Tags

NGSS.HS-PS1-7

How many atoms are in 117.3 grams of Potassium? Hint: Look at the periodic table and use your calculator

• 1.80x10²⁴ atoms

• 39.1 atoms

• 3 atoms

• 6.02x10²³ atoms

Tags

NGSS.HS-PS1-7

What has the most mass?

1 trillion atoms (1.0x10¹⁸) of zinc

1 trillion atoms of iron or

1 trillion atoms of aluminum

(Hint use Avogadro's Number 6.023x10²³ to determine the number of moles). Grams = MW x Moles)

• zinc

• iron

• aluminium

Tags

NGSS.HS-PS1-7

How much mass (in grams) does one trillion atoms (1.0x10¹⁸) of zinc have?

(Hint: Use Avogadro's number to determine moles) Remember that Grams = MW x Moles

• 65.39 grams of zinc

• 1.08x10^-4 grams of zinc

• 2.16x10⁴ grams of zinc

• 6.02x10²³ grams of zinc

Tags

NGSS.HS-PS1-7

Which is the smallest number show below?

• 1x10^-3

• 0.001

• 0.0003

• 1x10^-6

Which has the most mass in grams?

1 trillion atoms (1x10¹⁸) of zinc

100 trillion atoms (100x¹⁸) of iron or

500 trillion atoms (500x10¹⁸) of aluminium

• zinc

• iron

• aluminium

Tags

NGSS.HS-PS1-7

What is the scientific notation for 1,188,000,000,000 ?

• 1,188x10⁵

• 1.857x10¹⁵

• 1.888x10-¹²

• 1.188x10¹²

1 mole of zinc is how many atoms?

• 65.4

• 6.02x10²³

• 6.54x10²³

• 0.000,000,000,000,000,000,000,654

How many grains of rice is in a 5 pound bag of rice. The average weight of a grain of rice is 0.0221 grams.

(Hint: Use the Train Track Method)

Step 1 convert pounds to kilograms (1 kilogram is equivalent to 2.2 pounds)

Step 2 convert kilograms to grams (1 kilogram = 1,000 grams)

Step 3 convert grams to grains (There are 0.0221 grams/grain) or (4.53 E1 grains per gram)

• 2 grains

• 1.03 E5 grains

• 2.87 E23 grains

• 14,567 grains