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- 1. Multiple Choice
Which of the following gas samples would have the largest number of molecules at STP?
0.10 L NO
0.007 L CO2
15.0 L HCl
7.0 L Br2
- 2. Multiple Choice
How many molecules are in 3 mol NO?
3.49 x10-24 molecules
3.79x1024 molecules
1.26x1024 molecules
1.806 x1024 molecules
- 3. Multiple Choice
How many moles of CaBr2 are in 5.0 grams of CaBr2?
1000 mol
0.025 mol
4.0 mol
0.042 mol
- 4. Multiple Choice
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen?
12.0 g
47.8 g
23.9 g
95.6 g
- 5. Multiple Choice
The molar volume of a gas at STP occupies ____.
00C
1 kilopascal
22.4 L
12 grams
- 6. Multiple Choice
…………..S8 + ………..O2 …………..SO2
1,8,8
8,8,1
8,1,8
2,1,2
- 7. Multiple Choice
………AlCl3 + ………….KOH ………Al(OH)3 + ……….KCl
the numbers that balance this equation are3,1,3,1
1,3,1,3
3,3,1,1
1,1,3,3
- 8. Multiple Choice
Which of the following gases at STP would have the greatest volume?
0.200 mole of SO2
1.00 mole of N2
5.00 mole of H2S
4.00 mole of HBr
- 9. Multiple Choice
The molar mass of calcium carbonate is ........ gm
50
86
100
200
- 10. Multiple Choice
A chemical formula written over the arrow in a chemical equation signifies
a by-product.
the formation of a gas.
a catalyst for the reaction.
an impurity.
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