Introduction to Stoichiometry

What is the mole ratio of Mg to MgCl₂?

• 2 mol Mg/ 1 mol MgCl₂

• 1 mol Mg/ 2 mol MgCl₂

• 1 mol Mg/ 1 mol MgCl₂

• 2 mol Mg/ 2 mol MgCl₂

Tags

NGSS.HS-PS1-7

Mg_(s) + HCl_(aq) →MgCl_2(aq) + H_2(g)

The reaction of 2.5 mol of HCl will produce ______ mol of MgCl_2.

• 2.5

• 1.25

• 5.0

• 1.0

Tags

NGSS.HS-PS1-7

If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?

• 4 mol H₂O/ 5 mol O₂

• 5 mol O₂/ 4 mol H₂O

• 2 mol O₂/ 4 mol H₂O

• 4 mol O₂/ 2 mol H₂O

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ --> 2NH₃

How many moles of NH₃ is produced from 6 moles of N₂?

• 12 moles

• 3 moles

• 2 moles

• 1.5 moles

Tags

NGSS.HS-PS1-7

What is the first step in completing a stoichiometry problem?

• Calculating the Molar Mass

• Writing the Balanced Equation

• Write your Final Answer

• Use the Railroad Track Method to Calculate the Answer

Which part of a reaction is used to calculate the molar ratio?

• Subscripts

• You don't use the reaction

• Coefficients of the Unbalanced Reaction

• Coefficients of the Balanced Reaction

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

In the reaction
2 H₂ + O₂ → 2 H₂O
what is the mole ratio of oxygen to water

• 1:2

• 2:1

• 3:4

• 4:3

Tags

NGSS.HS-PS1-7

How many moles of hydrogen gas are needed to react completely with 2.0 moles of nitrogen gas? What is the mole ratio of hydrogen gas to nitrogen gas?

• 1:3

• 3:1

• 1:2

• 2:1

What are the coefficients if this following equation was balanced? Al + O₂ --> Al₂O₃

• 2, 3, 1

• 3, 2, 1

• 1, 2, 3

• 4, 3, 2

Tags

NGSS.MS-PS1-5