Unit 9: Stoichiometry Mole, mass and volume

How many moles of MgO are produced when 5.0 moles of magnesium is reacted?

2 Mg + O2 --> 2 MgO

• 1

• 2.5

• 5

• 10

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NGSS.HS-PS1-7

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

Use the following equation:

2Al + 3Cl2 → 2AlCl3

If 140 grams of aluminum chloride react, how many moles of aluminum will be produced?

• 5.10 moles of Al

• 1.05 moles of Al

• 2.25 moles of Al

• 3.42 moles of Al

Tags

NGSS.HS-PS1-7

Given the reaction: 
2Na + Cl₂ --> 2NaCl
How many liters of NaCl are produced if 4 moles of Cl₂ are used in the reaction at STP?

• 179.3 liters
• 8 liters
• 25 liters
• 22.4 liters

Tags

NGSS.HS-PS1-7

Which of the following is a correct interpretation of this equation?    
2 Al(s)  +  3 CuSO₄(aq)  -->  Al₂(SO₄)₃(aq)  +  3 Cu(s)

• a)  2 grams Al and 3 grams CuSO₄ react to form 1 gram Al₂(SO₄)₃ and 3 grams Cu
• a)  2 atoms Al and 3 molecules CuSO₄ react to form 1 molecule of Al₂(SO₄)₃ and 3 atoms Cu
• a)  2 moles Al and 3 moles CuSO₄ react to form 1 mole of Al₂(SO₄)₃ and 3 moles Cu
• a)  both b and c are correct

Tags

NGSS.HS-PS1-7

The mole ratio of two components in a chemical reaction is determined from the

• coefficients of each component
• mass of each component
• volume of each component

The equation N₂(g) + 3H₂(g) --> 2NH₃(g) can be interpreted by saying that 1 mol of N₂ reacts with 3 mol of H₂ to form 2 mol of NH₃.   True or False 

• True
• False

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NGSS.HS-PS1-7

2Al  +  3Br₂   -->  2AlBr₃  
How many moles of AlBr₃ will be formed from 6.0g of Br₂?

• 12 mol

• 0.19 mol

• 64.8 mol

Tags

NGSS.HS-PS1-7

Calculate the molar mass of calcium hydroxide.

• 114.18 g/mol
• 57.09 g/mol
• 74.11 g/mol
• 41.00 g/mol