Stoichiometry Practice

Balance the following reaction: (You will use this for the next few questions so write it down.)

Mg(s) + HCl(aq) --> MgCl₂(aq) + H₂(g)

• 1,2,1,2

• 2,1,1,2

• 1,2,1,1

• 1,2,2,2

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

• 5.00 g
• 7.29
• 182 g
• 218 g

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
What is the mass in grams of H₂ gas when 4.0 moles of HCl is added to the reaction?

• 0.99 g
• 4.0 g
• 2.0 g
• 6.0 g

Tags

NGSS.HS-PS1-7

Balance the following reaction: (Again, write this down because you are going to use it in the next few questions)

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

• 1,2,2,2

• 1,2,1,1

• 2,1,1,1

• 2,1,2,1

Using the balanced equation in question 5,

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

how many grams of H₂O are needed if 3.20 moles of CaC₂ are consumed?

• 115 g

• 28.8 g

• 0.0889 g

• 6.40 g

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 5,
 CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)
how many grams of Ca(OH)₂ would be formed with 3.20 moles of CaC₂?

• 119 g
• 21.2 g
• 114 g
• 237 g

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 5,
 CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)
how many moles of Ca(OH)₂ would be produced if 3.5 moles of H₂O are consumed?

• 1.75 moles
• 7.0 moles
• 3.5 moles
• 11 moles

Tags

NGSS.HS-PS1-7

Balance the following reaction: (Write this down)

C₂H₂(g) + O₂(g) --> CO₂(g) + H₂O(g)

• 4,10,2,1

• 2,5,4,2

• 1,2,2,1

• 4,10,2,2

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 9,

C₂H₂(g) + O₂(g) --> CO₂(g) + H₂O(g)

How many moles of water (H₂O) are produced when 25.0 grams of C₂H₂ are consumed?

• 0.960 moles

• 0.480 moles

• 1.92 moles

• 3.84 moles

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride (KCl) can be produced from 356 grams potassium bromide (KBr)? Round to one decimal point when calculating.

• 749 g

• 223 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7