APC: Stoichiometry

What is the molar mass of oxygen gas, O₂?

• 8 g/mol

• 16.00 g/mol

• 32.00 g/mol

What is the molar mass of lithium oxide, Li₂O?

• 22.00 g/mol

• 22.94 g/mol

• 29.88 g/mol

• 38.94 g/mol

What is the mass of 1.5 moles of carbon, C?

• 4.00 g C

• 8.00 g C

• 12.01 g C

• 18.02 g C

The particles in the image react according to the reaction below:

H₂ + Cl₂ → 2HCl

Which reactant is the excess reactant?

• Hydrogen, H₂

• Chlorine, Cl₂

• Both

• Neither

Tags

NGSS.HS-PS1-7

The molar mass of LiCl is 42.39 g/mol.

How many moles of LiCl are in 20.0 g LiCl?

• 0.20 mol LiCl

• 0.47 mol LiCl

• 2.12 mol LiCl

• 3.15 mol LiCl

Tags

NGSS.HS-PS1-7

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

Tags

NGSS.HS-PS1-7

2Al + 3Br₂ → 2AlBr₃

How many moles of Br₂ are needed to react with 4.0 moles of Al?

• 2.0 mol Br₂

• 3.0 mol Br₂

• 6.0 mol Br₂

• 12.0 mol Br₂

N_{2 (g)} + 3H_{2 (g)} → 2NH_{3 (g)}

How many liters of NH₃ gas can be made from 1.0 mole of N₂ and excess H₂?

• 2.0 L NH₃

• 22.4 L NH₃

• 44.8 L NH₃

• 67.2 L NH₃

N₂ + 3H₂ → 2NH₃

If the particles shown react according to the reaction above, which reactant is limiting?

• Hydrogen, H₂

  (the smaller ones)

• Nitrogen, N₂

  (the bigger ones)

• Neither

• Both

Tags

NGSS.HS-PS1-7

2Mg + O₂ → 2MgO

If 2.0 mol Mg and 2.0 mol O₂ combine, which is the limiting reactant?

• Mg

• O₂

• MgO

Tags

NGSS.HS-PS1-7