Mole Problem

How many moles are there in 6.35 g lithium?

How many moles are there in 346 g zinc?

How many atoms are there in 65.6 g silicon?

How many atoms are there in 1.24 g cobalt?

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.

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

What is the mole ratio of magnesium to iron?

• 3 : 2

• 2 : 3

• 1 : 2

• 3 : 1

C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C₂H₆). What is the final answer for this problem?

• 13 mol C₂H₆

• 3 mol O₂

• 21 mol O₂

• 42 mol O₂

If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

• 4 mol H₂O

• 6 mol H₂O

• 24 mol H₂O

• 96 mol H₂O

• 384 mol H₂O

Tags

NGSS.HS-PS1-7