Unit 4: Stoichiometry Review

Ca + 2 H₂O → Ca(OH)₂ + H₂

What coefficients are needed to balance the equation?

• 1,2,1,1

• 2,1,2,1

• 1,1,1,2

• 2,2,1,1

Tags

NGSS.HS-PS1-7

Ca + 2 H₂O → Ca(OH)₂ + H₂

What is the molar mass of calcium hydroxide?

• 74.1 g/mol

• 58.1 g/mol

• 100.1 g/mol

• 90.1 g/mol

Ca + 2 H₂O → Ca(OH)₂ + H₂

What is the molar ratio between calcium and water?

• 1:2

• 1:1

• 2:1

• 1:3

Ca + 2 H₂O → Ca(OH)₂ + H₂

What is the mass of 7.5 moles of calcium hydroxide?

• 555.8 g

• 370.5 g

• 450.0 g

• 600.0 g

Ca + 2 H₂O → Ca(OH)₂ + H₂

How many particles of Ca are in 3.0 moles of H₂?

• 1.8 x 10²⁴

• 6.0

• 6.02 x 10²³

• 3.01 x 10²³

Tags

NGSS.HS-PS1-7

 NaCl + AgNO₃ → AgCl + NaNO₃

If 15.0 g of NaCl reacts with 20.0 grams of AgNO₃, what is the limiting reactant when forming AgCl?

• AgNO₃ is the limiting reactant.

• NaCl is the limiting reactant.

 NaCl + AgNO₃ → AgCl + NaNO₃

If 15.0 g of NaCl reacts with 20.0 grams of AgNO₃, what is the theoretical yield?

• 16.9 g

• 10.0 g

• 20.5 g

• 5.0 g

 NaCl + AgNO₃ → AgCl + NaNO₃

A student performs a lab with 15.0 g of NaCl and 20.0 grams of AgNO₃.

If a student got 15.9 g in the lab, what is the percent yield and percent error?

• 94.1% yield and 5.9% error

• 90% yield and 10% error

• 85% yield and 15% error

• 80% yield and 20% error

MgCl₂ + 2 KBr → MgBr₂ + 2 KCl

How many particles are in 3.0 moles of KCl?

• 1.8 x 10²⁴

• 9.0 x 10²³

• 6.0 x 10²³

• 3.0 x 10²⁴

Tags

NGSS.HS-PS1-7

MgCl₂ + 2 KBr → MgBr₂ + 2 KCl

How many moles of KCl are in 5 x10²⁴ particles of MgCl₂?

• 16.6 moles

• 8.3 moles

• 12.5 moles

• 20.0 moles

Tags

NGSS.HS-PS1-7