Stoichiometry

Which is the correct mole ratio of K₃PO₄ to KNO₃ in the chemical reaction:
Mg(NO₃)₂ + K₃PO₄ → Mg₃(PO₄)₂ + KNO₃

• 1:1
• 2:3
• 1:3
• 1:2

Tags

NGSS.HS-PS1-7

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

How many grams of bromine are required to react completely with 37.4 grams aluminum chloride?
AlCl₃ + Br₂ → AlBr₃ + Cl₂

• 33.6 g
• 134.5 g
• 29.9 g
• 67.2 g

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NGSS.HS-PS1-7

How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?
2 H₂ + O₂ → 2 H₂O

• 0.277 g
• 22.5 g
• 45.0 g
• 90.0 g

Tags

NGSS.HS-PS1-7

How many grams of Fe₃O₄ are required to react completely with 300 grams of H₂?
Fe₃O₄ + H₂ → Fe +H₂O

• 2096 g
• 1.54 g
• 8597 g
• 37.5 g

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 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

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g
• 223 g
• 479 g
• 814 g

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?

• 13.7 mol
• 2.75 mol
• 6.11 mol
• 6.85 mol

Tags

NGSS.HS-PS1-7

How many moles are in 19.82 g Mg? 

• 1.226mol Mg
• 481.7mol Mg
• 1.000mol Mg
•  0.82 mol Mg

Tags

NGSS.HS-PS1-7