Unit 6 Stoichiometry Quiz

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

If 3.0 moles of Al(NO₃)₃ are used up in the following balanced reaction, how many moles of HNO₃ will be produced?  
2 Al(NO₃)₃(aq)  +  3 H₂SO₄(aq)  -->  Al₂(SO₄)₃(s)  +  6 HNO₃(aq)

• 9.0 moles
• 6.0 moles
• 3.0 moles
• 2.0 moles

Given the equation,    
Mg(OH)₂  +  2 HCl  --> MgCl₂  +  2 H₂O    
If 33.5 g of Mg(OH)₂ react, what mass of H₂O could be produced?

• 20.7 g
• 29.2 g
• 33.5 g
• 67.0 g

Tags

NGSS.HS-PS1-7

When doing a mass-mass stoichiometry calculation, the mass of the first component is first converted into

• liters
• moles
• number of atoms
• number of molecules

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

Calculate the molar mass of Mg(OH)_2.

• 41.32 g/mol
• 58.33 g/mol
• 82.64 g/mol

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

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

• 12 mol
• 0.19 mol
• 64.8 mol

What mass of oxygen (O₂) is required to react completely with .25mols of C₃H₈?
C₃H₈  +  5O₂  --> 3CO₂  +   4H₂O

• 40.0 g
• 160.0 g
• 32.0 g
• 88.2 g

Calculate the molar mass of C₃H₈.

• 44.11 g/mol
• 13.02 g/mol
• 37.04 g/mol