Calculate the mass of 2.50  104 molecules of nitrogen gas (8 points) SHOW calculations to receive credit. Remember nitrogen exists in diatomic state. A. 4.15 x 10-20 g B. 1.16 x 10-18 g C. 3.50 x 105 g D. 5.81 x 10-19 g E. 7.00 x 105 g Which characteristics pertain to the problem of global warming?
I. Possible consequences include altered climate and increased sea level.
II. Heat energy radiated by the earth is captured by atmospheric molecules.
III. Increased skin cancer incidence and damage to radiation sensitive species has been observed.
IV. The concentration of stratospheric ozone is declining.
a. I and II
b. II and III
c. I and III
d. I and IV
e. III and IV
f. All of the above

Which conclusion was considered "very likely" in the 2014 report of the Intergovernmental Panel on Climate Change?
A. Human-caused emissions are the main factor causing warming since 1951
B. The observed warming of the past 100 years is due solely to climate variability
C. The Arctic Sea ice thickness decreased approximately 40% during late summer/early fall
D. Summer droughts have increased

13. Dodecane, C12H26 is one of the components of gasoline. How many grams of CO2 is produced during the combustion of 9378 g of this compound? SHOW calculations to receive credit. (10 points) 2C12H26 + 37O2 → 24CO2 + 26H2O