Transcript Quiz

Quiz
1. How many kg of carbon dioxide (CO2) can be created by burning a
lump of coal that contains 10.0 kg of carbon? Show your work.
MW of C = 12.01 g/mole
MW of O = 16.00 g/mole
A. 10.0 kg
C. 36.6 kg
B. 3.66 kg
D. none of these
2. If a lump of coal contains 10.0 kg of carbon and is 88.5% Carbon
by mass, what is the mass of the lump of coal? Show your work.
A. 10.0 kg
C. 11.3 kg
B. 8.85 kg
D. none of these
Quiz
3. Why is it important to use the correct number of significant
figures?
A. To avoid a long list of numbers reported by some calculators.
B. The number of significant figures tell something about the
precision of the number.
C. The number of significant figures tell something about the
accuracy of the number.
D. It is not important.
4. How many significant figures are in the number 1.03 x 102?
A. 2
C. 4
B. 3
D. 5