Two Step Chemistry Problems

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

(molar mass of O₂ = 32 g/mol)

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

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

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

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

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

CH₄ + 2 O₂ → CO₂ + 2 H₂O

How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

(molar mass of CH₄ = 16.05g/mol)

• 13.7 mol

• 2.75 mol

• 6.11 mol

• 6.85 mol

How many steps will it take me to go from grams to grams?

• 4

• 3

• 2

• 1

Tags

NGSS.HS-PS1-7

How many step will it take for me to go from grams of the given to moles of the find?

• 1

• 2

• 3

• 4

I use molar mass when the problem gives me grams?

• False

• True

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

(molar mass of O₂ = 32g/mol)

• 1.05 moles

• 3.75 moles

• 1.875 grams

• 1.875 moles

Tags

NGSS.HS-PS1-7