Mole Ratio

What can be determined from a balanced chemical equation?

• mole ratio of any two substances in the reaction

• total energy released from the reaction

• electron configuration of all elements in the reaction

• sequence of events that lead to formation of products

Tags

NGSS.HS-PS1-7

Where are the numbers for a mole ratio found?

• They are part of the chemical formula.

• They are given in the problem.

• They are found using the periodic table.

• They are found as coefficients in the balanced chemical equation.

A balanced chemical equation tells us the relative amounts (unit mol) or the ratios of reactants and products.

In the balanced equation 2HgO → 2Hg + O₂, what is the mole ratio of HgO to O₂?

• 2 : 2

• 1 : 1

• 2 : 1

• 1 : 2

Tags

NGSS.HS-PS1-7

In the balanced equation 2Al₂O₃ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen?

• 3 : 2

• 3 : 4

• 4 : 3

• 2 : 3

3Mg + Fe₂O₃ → 3MgO + 2Fe

What is the mole ratio of magnesium to iron?

• 3 : 2

• 2 : 3

• 1 : 2

• 3 : 1

Tags

NGSS.HS-PS1-7

2AgNO₃ + Cu → Cu(NO₃)₂ + 2Ag

What is the mole ratio of silver nitrate to copper(II) nitrate?

• 2 : 2

• 1 : 1

• 1 : 2

• 2 : 1

Tags

NGSS.HS-PS1-7

Mg + 2HCl → MgCl₂ + H₂

When 1 mole of HCl is used, how many moles of MgCl₂ will be produced?

• 2 mol

• 1 mol

• 0.5 mol

• 4 mol

H₂ + Cl₂ → 2HCl

What is the total number of moles of HCl produced after 3 moles of H₂ is completely used up?

• 2 mol

• 3 mol

• 5 mol

• 6 mol

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ → 2NH₃

How many moles of N₂ is needed to react with 6 moles of H₂?

• 2 mol

• 3 mol

• 4 mol

• 18 mol

2Na + S → Na₂S

8 moles of sodium reacted with an excess of sulfur to produce sodium sulfide. What is the number of moles of sodium sulfide produced?

• 1 mol

• 2 mol

• 0.5 mol

• 4 mol

Tags

NGSS.HS-PS1-7