A b or d that’s the answer i think idek
Answer: 39.86 g/mol
Explanation:
Assuming this gas is at a pressure of 
and a temperature of 
, we can solve this problem with the Ideal Gas Law equation:
(1)
Where:
is the pressure of the gas
is the volume of the gas
the number of moles of gas
is the gas constant
is the absolute temperature of the gas in Kelvin
On the other hand, we know the density 
is given by a relation between the mass 
and the volume :
(2)
Then, the mass is:
(3)
Another important fact here is that the molar mass 
of an element is given by a relation between the mass of that element and the number of moles it contains:
(4)
Isolating :
(5)
Substituting (5) in (1):
(6)
Substituting (3) in (6):
(7)
Isolating :
(8)
Simplifying:
(9)
Solving with the given data:
(10)
Finally:
This is the molar mass of the gas
The bird's eye contains a nictitating membrane which is a translucent, semitransparent inner eyelid. It sweeps across the surface of the eye enabling the bird to blink without losing sight of or without blocking their view.
Birds also have two different tear glands. One type of tear gland is located along the lower eyelid while the other is located at the base of the nictitating membrane. The second tear gland lubricates the bird's eyes whenever the nictitating membrane blinks.
Answer:
the movements of rivers, tectonic activity, and erosion.
