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- 1. Multiple Choice
Where do we find the MOLE RATIO that can be used for stoichiometry?
molar mass of each substance
coefficients in a balanced chemical equation
on the periodic table
total mass of the products
- 2. Multiple Choice
What is the MOLE RATIO between O₂ and H₂O?
4:4
5:4
4:6
5:6
- 3. Multiple Choice
The coefficients in the balanced chemical equation show:
molecules and moles
molecules and grams
moles and grams
molecules, moles & grams
- 4. Multiple Choice
100.09g
100g
100.2g
101g
- 5. Multiple Choice
89mol
0.90mol
0.89mol
84mol
- 6. Multiple Choice
2Al + 6HCl --> 2AlCl3 + 3H2
Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?
13
8.8
0.99
1.0
- 7. Multiple ChoiceHow many particles are in a mole?602602 million602 moles6.02 x 1023
- 8. Multiple ChoiceBalance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF1,1,1,11,2,1,12,1,1,22,1,2,1
- 9. Multiple Choice
Which one is the empirical formula?
C4H6
CH
CH3
C2H3
C4H6
- 10. Multiple ChoiceA chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________ionic formulacovalent formulaempirical formulamolecular formula
- 11. Multiple ChoiceHow many moles are 2.85 x 1020 atoms of iron?4.73 x 10-4 moles1.72 x 104 moles1.72 x 10-42 moles4.73 x 104 moles
- 12. Multiple Choice
Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?
A
B
C
D
- 13. Multiple ChoiceN2 + 3H2 −-> 2NH3
How many moles of ammonia are produced when 3 moles of nitrogen react with hydrogen?6 moles ammonia1.5 moles ammonia9 moles ammonia9 moles hydrogen - 14. Multiple Choice2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?0.85 g290 g450 g870 g - 15. Multiple Choice
1 : 3
2 : 3
1 : 1
3 : 2
- 16. Multiple Choice
0.9 mol
18 grams
0.53 mol
36 grams
- 17. Multiple Choice
If 30 liters of hydrogen gas (H2) are produced, how many liters of oxygen gas (O2) would be produced?
2H2O >> 2H2 + O2
30 L
60 L
15 L
22.4 L
- 18. Multiple ChoiceFor the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?749 g225 g479 g814 g
- 19. Multiple ChoiceA compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?Mg4N3MgN2Mg3N2MgN
- 20. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
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