Answer:
0.286 moles
Explanation:
i hope this is helpful for you 
 
        
                    
             
        
        
        
Answer:
Because your body has built-in resistance to certain gases, no matter the size of the gas cloud.
That is why we are able to stay non-inert to these types of gases, like Carbon dioxide.
 
        
             
        
        
        
<span>Gallium-72 that is what i got when i did the math for it</span>
        
             
        
        
        
The isotope that is more abundant, given the data is isotope Li7
<h3>Assumption</h3>
- Let Li6 be isotope A
 - Let Li7 be isotope B
 
<h3>How to determine whiche isotope is more abundant</h3>
- Molar mass of isotope A (Li6) = 6.02 u
 - Molar mass of isotope B (Li7) = 7.02 u
 - Atomic mass of lithium = 6.94 u
 - Abundance of A = A%
 - Abundance of B = (100 - A)%
 
Atomic mass = [(mass of A × A%) / 100] + [(mass of B × B%) / 100]
6.94 = [(6.02 × A%) / 100] + [(7.02 × (100 - A)) / 100]
6.94 = [6.02A% / 100] + [702 - 7.02A% / 100]
6.94 = [6.02A% + 702 - 7.02A%] / 100
Cross multiply
6.02A% + 702 - 7.02A% = 6.94 × 100
6.02A% + 702 - 7.02A% = 694 
Collect like terms
6.02A% - 7.02A% = 694 - 702
-A% = -8
A% = 8%
Thus,
Abundance of B = (100 - A)%
Abundance of B = (100 - 8)%
Abundance of B = 92%
SUMMARY
- Abundance of A (Li6) = 8%
 - Abundance of B (Li7) = 92%
 
From the above, isotope Li7 is more abundant.
Learn more about isotope:
brainly.com/question/24311846
#SPJ1
 
        
             
        
        
        
Technically there is only one phase unless you account for a solution where you have a pure liquid with something dissolved in it. Unless you count aqueous as a phase which is just dissolved. Since you are in high school the answer you are looking for is one.  <span />