1.

Silver (Atomic weight =108g "mol"^(-1) has a density of 10.5g cm^(-3). The number of silver atoms on a surface area of 10^(-12) can be expressed in scientific notation as yxx10^(x). The value of x is:

Answer»


Solution :Mass of 1 `cm^(3)Ag=1xx10.5g`
NUMBER of ATOMS `-(10.5)/(108)xx6.023xx10^(23)`
Number of atoms in 1 cm`=[(10.5)/(108)xx6.023xx10^(23)]^(1//3)`
Number of atoms in `1 cm^(2)=[(10.5)/(108)xx6.023xx10^(23)]^(2//3)`
Number of atoms in `10^(-2)m^(2)` or `10^(-8)cm^(2)`
`=[(10.5)/(108)xx6.023xx10^(23)]^(2//3)xx10^(-8)=1.5xx10^(7)`.


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