Answer:
8
Explanation:
1 mole = 6.02 × 10²³ atoms
? moles = 4.816 × 10²⁴ atoms.
? Moles = 4.816 × 10²⁴ ÷ 6.02 × 10²³
? Moles = 8 moles
8 moles of aluminum = 4.816 × 10²⁴
 
        
                    
             
        
        
        
Ideal gases are hypothetical gases whose molecules occupy negligible space and have no interactions, and that consequently obeys the gas laws exactly.
Not exactly sure about the amount...
I hope this helps! :)
        
             
        
        
        
Answer:
m = 65.637 g
Explanation:
Heat = 0.612 kJ = 612 J ( Converting to J by multiplying by 1000)
Initial Temperature =  30.°C
Final Temperature = 51°C
Temperature change = Final Temperature - Initial Temperature = 51 - 30 = 21°C
Mass = ?
The relationship between these quantities is given by the equation;
H = mCΔT
where c = 0.444 J/g°C
Inserting the values in the equation;
612 = m *  0.444 * 21
m = 612 / (0.444 * 21)
m = 65.637 g
 
        
             
        
        
        
The two molecular characteristics of substances that typically form liquid cyrstals and there phases are  long, cylindrical shape and between molecules & strong intermolecular forces exist
All these enables different application of liquid crystals
To know  more about liquid crystals here
brainly.com/question/24378459
#SPJ4
 
        
             
        
        
        
Answer:
Solution:-
The gas is in the standard temperature and pressure condition i.e. at S.T.P
Therefore,
V 
i
	
 =22.4dm 
3
 
V 
f
	
 =?
As given that the expansion is isothermal and reversible 
∴ΔU=0
Now from first law of thermodynamics,
ΔU=q+w
∵ΔU=0
∴q=–w
Given that the heat is absorbed.
∴q=1000cal
⇒w=−q=−1000cal
Now,
Work done in a reversible isothermal expansion is given by-
w=−nRTln( 
V 
i
	
 
V 
f
	
 
	
 )
Given:-
T=0℃=273K
n=1 mol
∴1000=−nRTln( 
V 
i
	
 
V 
f
	
 
	
 )
⇒1000=−1×2.303×2×273×log( 
22.4
V 
f
	
 
	
 )
Explanation: