Basic Stoichiometry

Molar masses are determined from

• the mole ratio of a given amount of reactant to an unknown amount of product
• the periodic table
• any mole ratio in the equation
• a conversion factor

Tags

NGSS.HS-PS1-7

2H₂  (     ) +   O₂  (     )→  2H₂O (     )
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles

Tags

NGSS.HS-PS1-7

N₂ (     ) +  3H₂ (     )→ 2NH₃ (     )
How many moles of hydrogen are needed to react with 5 moles of nitrogen?

• 6
• 2
• 3
• 15

Tags

NGSS.HS-PS1-7

2 KClO₃ (     ) → 2 KCl (     ) + 3 O₂ (     )
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

Tags

NGSS.HS-PS1-7

SiO₂ (     ) + 3C (     )→ SiC (     ) + 2CO (     ) 
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

• 96 g
• 0.67 g
• 2.67 g
• 48 g

Tags

NGSS.HS-PS1-7

C₃H₈ (     ) + 5 O₂ (     )→ 3 CO₂ (     ) + 4 H₂O (     )
Suppose that an excess of propane, C₃H₈ burns in 320 g of O₂. How many moles of H₂O will be formed?

• 0-5
• 6-10
• 10-15
• >15

2 H₂ (     ) + O₂ (     ) → 2 H₂O (     )
How many grams of water can be prepared from 8 grams of hydrogen at standard conditions?

• 0-25
• 26-50
• 50-75
• >75

Tags

NGSS.HS-PS1-7

2 CO (     ) + O₂ (     )→ 2 CO₂ (     )
How many moles of carbon monoxide are needed to react completely with 7.0 moles of oxygen gas?

• 0-5
• 6-10
• 11-15
• >15

Tags

NGSS.HS-PS1-7

Al₂(CO₃)₃ (     )→ Al₂O₃ (     ) + 3 CO₂ (     )
How many moles of carbon dioxide, CO₂, can be formed by the decomposition of 5 moles of aluminum carbonate, Al₂(CO₃)₃?

• 0-5
• 6-10
• 11-15
• >15

Tags

NGSS.HS-PS1-7

2 KClO₃ (     )→ 2 KCl (     ) + 3 O₂ (     )
How many grams of oxygen are produced by the decomposition of 1 mole of potassium chlorate, KClO₃?

• 0-25
• 26-50
• 51-75
• >75