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- 1. Multiple Choice
The equation below is balanced. 2 H₂(g) + O₂(g) → 2 H₂O(g) If 8.0 moles of O₂ are completely consumed, what is the total number of moles of H₂O produced?
4
8
16
32
- 2. Multiple Choice
Which substance below has the greatest mass?
1 mole of silver
1 mole of copper
1 mole of lead
1 mole of tungsten
- 3. Multiple Choice
How many grams of N₂ are in 3.0 x 10²³ molecules of N₂?
2.0 g of N₂
14 g of N₂
38 g of N₂
71 g of N₂
- 4. Multiple Choice
What is the approximate total number of atoms in 1.0 mole of lithium?
3.0
6.9
1.0 x 10²³
6.0 x 10²³
- 5. Multiple Choice
How many atoms are in a 59 g sample of gold?
3.00 atoms
116,000 atoms
1.81 x 10²⁴ atoms
3.60 x 10²⁵ atoms
- 6. Multiple Choice
What is the molar mass of CaF₂?
40.0 g/mol
78.0 g/mol
99.0 g/mol
56.0 g/mol
- 7. Multiple Choice
Which of the following is an empirical formula for a compound?
(hint: lowest ratio of elements)
N₂H₂
C₂H₄
NH₃
N₂H₆
- 8. Multiple Choice
The equation below represents the reaction between a metal and a solution.
Mg + 2 HCl → MgCl2 + H2
How many grams of HCl react when 2 mole of H2 is produced? (molar mass of HCl=36.46 g/mol)
2.008 g
4.016 g
73 g
146 g
- 9. Multiple Choice
Which of the following statements about benzene (C6H6) is true?
The empirical formula is C6H6.
The molecular formula is C6H6.
Both the empirical and molecular formulas are C6H6.
Neither the empirical nor molecular formula is C6H6.
- 10. Multiple Choice
Consider the reaction below:
__H2 (g) +__ N2 (g) → __NH3 (g).
Balance the equation above.
What are the coefficients that balance the equation?
1, 1, 1
3, 1, 2
2, 1, 3
1, 2, 3
- 11. Drag and Drop
Consider the reaction below:
3 H2 (g) + 1 N2 (g) → 2 NH3 (g).
The mole ratio between Hydrogen and Nitrogen is (a)
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