Stoichiometry

Using the following equation:
Fe₂O₃(s) + 3H₂(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

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6 mol H

• 2 mol H

• 3 mol H

• 1 mol H

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, they are calculating the:

• theoretical yield.

• mole ratio.

• actual yield.

• percentage yield.

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

What is a excess reagent?

• amount you end with

• what you run out of first

• what you have left over

• what you start with

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.
 
Mg +  2HCl --> MgCl₂  +  H₂   
 

• Mg
• H2
• MgCl2
• HCl

Tags

NGSS.HS-PS1-7

What is the formula for percent yield?

When does a chemical reaction stop?

• when the lab is finished

• when the excess reactant is used up

• when the limiting reactant is used up

• chemical reactions never stop

Tags

NGSS.HS-PS1-6

Mole ratios are obtained from a/the:

• balanced chemical equation.

• periodic table.

• molar mass of reactants.

Tags

NGSS.HS-PS1-7

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 460 grams

• 452 grams

• 462 grams

Tags

NGSS.HS-PS1-7