Stoichiometry Particles to Particles

Balance the following reaction :
 
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

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

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

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 2

• 3

• 1

Tags

NGSS.MS-PS1-5

How many particles are in a mole?

• 602

• 602 million

• 602 moles

• 6.02 x 10²³

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron (Fe) can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Tags

NGSS.HS-PS1-7

WO₃ + H₂ --> W + H₂O
What coefficient goes in front of H₂?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

• 10 moles

• 5 moles

• 8 moles

• 4 moles

What is the mole ratio of hydrogen to water in the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@?

• 1:1

• 2:1

• 1:2

• 2:2

Tags

NGSS.HS-PS1-7

In the reaction @@ ext{N}_2 + 3 ext{H}_2 ightarrow 2 ext{NH}_3@@, how many moles of ammonia are produced from 6 moles of hydrogen?

• 2 moles

• 4 moles

• 3 moles

• 6 moles