Stoichiometry

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

Tags

NGSS.HS-PS1-7

4 Al + 3 O₂ –> 2 Al₂O₃  How many moles of aluminum would be needed to completely react with 45 grams of O₂?

• 1.05 moles
• 3.75 moles
• 1.875 grams
• 1.875 moles

2H₂   +   O₂    −−〉 2H₂O
8.3 moles H₂ −−〉moles H₂O

• 4.15
• 8.3
• 16.6
• 74.04

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.HS-PS1-7

Calculate the molar mass of Mg(OH)_2.

• 33.2 g/mol
• 41.3 g/mol
• 86.9 g/mol
• 58.3 g/mol

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

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

• 6 moles Fe
• 4 moles Fe
• 2 moles Fe
• 1 moles Fe

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

• 10:6 
• 3:4
• 4:3
• 2:3

How many molecules are in 1 mole of CO₂?

• 4.6 molecules
• 4.6 grams
• 6.02 x 10 ²³ molecules
• 1.806x 10 ²⁴ atoms