Moles and Stoichiometry

How many molecules are in 3.6 grams of sodium chloride (NaCl)?

• 0.06

• 1.0 X 10²¹

• 1.3 x 10²⁶

• 3.7 x 10²²

What is the molar mass of C₂H₄O₂?

• 40 g/mol

• 50 g/mol

• 60 g/mol

• 68 g/mol

What is the mass of 0.75 moles of (NH₄)₃PO₄?

• 101.75 g
• 121.75 g
• 111.75 g
• 131.75 g

Tags

NGSS.HS-PS1-7

The number 6.02 x 10²³ is called...

• Obama's number and it measures the amount of gases or liters in a mole

• Bohr's number and it measures the amount of molecules or atoms in a sample

• Avogadro's number and it measures the amount of gas in moles

• Avogadro's number and it measures the amount of molecules or atoms in a sample

How many moles would be in 8.40 grams of octane, C₈H₁₈?

• 0.0735 moles

• 5.04 x 10²⁴ moles

• 959 moles

• 0.645 moles

Tags

NGSS.HS-PS1-7

_N₂ + _H₂ → _NH₃

What is the mole ratio between N₂ and NH₃ if you balanced the above equation correctly?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

Tags

NGSS.HS-PS1-7

Which of the following represent a mole ratio between silver nitrate and copper(II) nitrate in the following reaction:

2AgNO₃ + _Cu → _Cu(NO₃)₂ + 2Ag

• 2 : 2

• 1 : 2

• 1 : 1

• 2 : 1

Tags

NGSS.HS-PS1-7

Using the following equation:

_Fe₂O_3(s) + 3H_2(g) → 2Fe_(s) + 3H₂O_(l)

How many moles of iron can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Tags

NGSS.HS-PS1-7

_Fe _(s) + _S _(l) → _FeS _(s)

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.

How much FeS is formed?

• 14.8 g

• 12.2 g

• 13.7 g

• 19.9 g

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ _H₂

How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7