Calculate the mass of 2.50 × 104 molecules of nitrogen gas.

Calculate the mass of 2.50 ´ 104 molecules of
nitrogen gas (8 points)
Calculate the mass of 2.50 ´ 104 molecules of
nitrogen gas (8 points) 4 (8 points) SHOW calculations to receive
credit. Remember nitrogen exists in diatomic state. SHOW calculations to receive
credit. Remember nitrogen exists in diatomic state. A. 4.15 x 10-20 g -20 B. 1.16 x 10-18 g -18 C. 3.50 x 105 g 5 D. 5.81 x 10-19 g -19 E. 7.00 x 105 g 5
Which characteristics pertain to the problem of global
warming?
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.
I and II
II and III
I and III
I and IV
III and IV
All of the above
I and II II and III I and III I and IV III and IV All of the above
Which conclusion was considered “very likely” in the 2014
report of the Intergovernmental Panel on Climate Change?
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) 12 26 2 SHOW calculations to receive credit (10
points)
2C12H26 +
37O2 → 24CO2 + 26H2O 12 26 2 2 2

Answer : B.) 1.16
x 10 ^-18 gram ✅
nitrogen gas is define as N2. (Because exist in diatomic state
)
moleculer mass = 28.
So, for one mole of N2 = 28gram.
Now, by using mole concept :
In one mole, there is
6.022*10^23
moles are present.
so mass of 1 molecule of nitogen gas is 28/(6.022*10^23)
gram
Thus, mass of 2.50*10⁴ molecule of N2 gas =
(28* 2.50*10⁴)/(6.022*10^23) gram
= 1.16 x 10 ^-18 gram
Thanks