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Q.

If the atomic mass of Li and Cl are 7 and 35.5 amu respectively, then what would be the number of LiCl molecules in a cube of LiCl with length × breadth × height = 1 × 1 × 1 cm3?


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a

Nearly2.5×1022   

b

Nearly4×1020    

c

Nearly12×1030   

d

Nearly14×1023  

answer is A.

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Detailed Solution

Total Atomic mass = 7+35.5=42.5 amu
No. of LiCl molecules = 42.5×6.022×1023×10-6
                                   = 255.935×1023×10-6                                    ≈2.5×1022 molecules
  
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