Answer:  atoms of hydrogen are there in
 atoms of hydrogen are there in 
35.0 grams of hydrogen gas.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number  of particles.
 of particles.
To calculate the moles, we use the equation:
 
1 mole of hydrogen  =
 =  atoms
 atoms
17.5 mole of hydrogen  =
 =  atoms
 atoms
There are  atoms of hydrogen are there in
 atoms of hydrogen are there in 
35.0 grams of hydrogen gas.
 
        
             
        
        
        
Consider the isomerization of butane with equilibrium constant is 2.5 .The system is originally at equilibrium with :
[butane]=1.0 M , [isobutane]=2.5 M
If 0.50 mol/L of butane is added to the original equilibrium mixture and the system shifts to a new equilibrium position, what is the equilibrium concentration of each gas? 
Answer:
The equilibrium concentration of each gas:
[Butane] = 1.14 M
[isobutane] = 2.86 M
Explanation:
Butane  ⇄  Isobutane
At equilibrium
1.0 M               2.5 M
After addition of 0.50 M of butane:
(1.0 + 0.50) M               -
After equilibrium reestablishes:
(1.50-x)M            (2.5+x)
The equilibrium expression will wriiten as:
![K_c=\frac{[Isobutane]}{[Butane]}](https://tex.z-dn.net/?f=K_c%3D%5Cfrac%7B%5BIsobutane%5D%7D%7B%5BButane%5D%7D)

x = 0.36 M
The equilibrium concentration of each gas:
[Butane]= (1.50-x) = 1.50 M - 0.36M = 1.14 M
[isobutane]= (2.5+x) = 2.50 M + 0.36 M = 2.86 M
 
        
             
        
        
        
Gravity pulling the mass of the atmosphere toward the center of the
earth. Atmosphere includes air, water vapor, etc. 
        
                    
             
        
        
        
Answer: The Sun Could Be Seen Once during the year when north of the equator.
 
        
             
        
        
        
Answer:
B
Explanation:
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