In C, a matrix is stored in memory as a contiguous block of memory. The elements of the matrix are stored in row-major order, which means that the elements of each row are stored in contiguous memory locations, and the rows themselves are also stored in contiguous memory locations.

To calculate the memory address of a particular element of a matrix, we can use the following formula:

```
address = base_address + (row_index * num_columns + column_index) *
element_size
```

where `base_address` is the memory address of the first element of the matrix, `row_index` and `column_index` are the indices of the desired element, `num_columns` is the number of columns in the matrix, and `element_size` is the size of each element in bytes.

Here is an example code that calculates the memory address of an element in a matrix:

#include <stdio.h>

#define ROWS 3
#define COLS 3

int main() {
    int matrix[ROWS][COLS] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

    int row_index = 1;
    int col_index = 2;
    int element_size = sizeof(int);

    // calculating the memory address of the element
    int base_address = (int)matrix;
    int address = base_address + (row_index * COLS + col_index) * element_size;

    // printing the element and its memory address
    printf("Element at (%d, %d) = %d\n", row_index, col_index, matrix[row_index][col_index]);
    printf("Memory address of element at (%d, %d) = %p\n", row_index, col_index, (void*)address);

    return 0;
}

In this code, we have defined a matrix with 3 rows and 3 columns using a two-dimensional array `matrix[ROWS][COLS]`. We have also defined the indices of the desired element (`row_index` and `col_index`) and the size of each element in bytes (`element_size`).

To calculate the memory address of the desired element, we first calculate the memory address of the first element of the matrix (`base_address`) by casting the matrix to an integer. We then use the formula above to calculate the memory address of the desired element (`address`).

Finally, we print the value of the desired element and its memory address using `printf`. When the code is executed, it will print the following output:

```
Element at (1, 2) = 6
Memory address of element at (1, 2) = 0x7ffc87d7a0a8
```

This output shows the value and memory address of the element at row 1 and column 2 of the matrix.

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