2/17/2010
What is the sum of the atomic masses of all the atoms in sucrose, C12H22O11?
1. 2. 3. 4.
In class Activities
182 amu 270 amu 342 amu none of the above
98% 82%
February 16, 2010 Afternoon class results
1
How much do Avogadro’s number of sulfur atoms weigh? 16 g 32 g 16 amu 6.02 x 1023 amu
79%
1
2
3
0.5 moles 1 mole 9 moles 18 moles
2
0% 3
4
1
32.00 g 48.00 g 61 22 g 61.22 122.45 g
2% 2
0% 3
4
How many grams of water are produced from 1.25 moles of methane? 1 CH4 + 2 O2
1. 2. 3 3. 4.
2 H2O
+ 1 CO2
11.25 grams 22.5 grams 45 grams 90 grams
10%
4
Water, H2O, has a formula mass of 18. How many moles of water are there in 18 grams of water?
1. 2. 3. 4.
1 gram 9 grams 18 grams 36 grams
0%
How many grams of oxygen can be produced from 122.45 g of KClO3? 2 KClO3 2 KCl + 3 O2
1. 2. 3 3. 4.
7%
5%
1. 2. 3. 4 4.
18% 0%
1. 2. 3. 4.
How many grams of water, H2O, are there in 2 moles of water?
How many moles are in 45.5 grams of chlorine gas?
1. 2. 3. 4.
89%
0.55 moles 0.64 moles 1.28 moles 1.34 moles
87%
Explanation: Chlorine gas is a diatomic, Cl2.
8% 0% 1
2
3
3% 4
9%
4% 1
0% 2
3
4
1
