1.

A solid having density of 9 xx 10^3 "kg m"^(-3) form face centred cubic crystals of edge length 200sqrt(2) pm. What is the molar mass of solid ? (Avogadro's constant = 6 xx 10^23 "mol"^(-1), pi = 3)

Answer»

`0.0216 "kg MOL"^(-1)` 
`0.0432 "kg mol"^(-1)`
`0.4320 "kg mol"^(-1)` 
`0.0305 "kg mol"^(-1)`

Solution :`d = (Z xx M)/(a^3 xx N_A)`
`THEREFORE 9 xx 10^3 = (4 xx M)/((200 sqrt(2))^3 xx 10^(-36) xx 6 xx 10^(23))`
`therefore M = 0.0305 "kg mol"^(-1)`.


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