Mol-Mol Stoichiometry

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4

• 4:6

• 1:3

• 3:1

Tags

NGSS.HS-PS1-7

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

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.MS-PS1-5

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

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

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

• 1,1,1,1

• 1,2,1,1

• 2,1,1,2

• 2,1,2,1

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

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

• Avogadro's Number

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 460 grams

• 452 grams

• 462 grams