1.

Specific heat of `Li(s),Na(s),K(s),Rb(s)` and `Cs(s)` at `398K` are `3.57,1.23,0.756,0.363` and `0.242 J g^(-1)K^(-1)` respectively. Compute the molar heat capacity of these elements and identify any periodic trend. If there is trend, use it to predict the molar heat capacity of `Fr`.

Answer» Molar heat capacity `=at.wt. xx ` specific heat.
Molar heat capacity `( i n J mol^(-1) K^(-1))` of `:`
`{:(Li(s),=,3.57xx6.94,=,24.78),(Na(s),=,1.23xx22.99,=,28.28),(K(s),=,0.756xx39.10,=,29.56),(Rb(s),=,0.363xx85.47,=,31.03),(Cs(s),=,0.242xx132.91,=,32.16):}` ltbr. There is a trend plotting these values with atomic number, the extrapolation of graph gives the value of `Fr(s0`
`=33.5J mol^(-1)K^(-1)`


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