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`.

Explanation

To solve the problem, we will compute the molar heat capacities of the given alkali metals (Li, Na, K, Rb, Cs) using the formula for molar heat capacity, and then identify any periodic trends. Finally, we will predict the molar heat capacity for Francium (Fr).

### Step-by-step Solution:

1. **Understanding the Formula**:
The molar heat capacity (\(C_m\)) can be calculated using the formula:
\[
C_m = \text{Specific Heat} \times \text{Atomic Weight}
...