Asked by Saira
                How would i calculate the density of Li2S in grams per cubic centimeter?
I have to use the equation :
density= mass/ volume:
But i don't know how to find out the volume using the edge length of the unit cell which is 5.88* 10^2 pm.
            
            
        I have to use the equation :
density= mass/ volume:
But i don't know how to find out the volume using the edge length of the unit cell which is 5.88* 10^2 pm.
Answers
                    Answered by
            Saira
            
    and how can i find out the mass m in grams of a unit cell of Li2S.
when the formula units in the unit cell for Li2S is 4.
    
when the formula units in the unit cell for Li2S is 4.
                    Answered by
            DrBob222
            
    If the edge length is 5.88 x 10^2 pm, first convert that to cm, then cube that to find the volume in cc. 
The mass of a unit cell is (4 x molar mass)/6.022 x 10^23.
    
The mass of a unit cell is (4 x molar mass)/6.022 x 10^23.
                    Answered by
            DrBob222
            
    My answer for mass is for 4 atoms to the unit cell. I don't know if that's the same as 4 formula units per unit cell or not.
    
                    Answered by
            ElleSee
            
    1.50g/cm^3
    
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