Addressing in hex file

Ok. There is still something not very clear. I have two questions, I think the answer are linked.

So, the address bus is on 32 bits. But in the hex file the maximum we can reach is FFFF (max address with 00 record) + FFFF0 (max address we can add with 02 record) = 10FFEF. So we are far from FFFFFFFF.

Secondly, in SOPC Builder, if I put a memory of 16 Kio, I have for example a span from 0x0000C000 to 0x0000FFFF, which means 16384 addresses. Does that means that at one address, we store 1 bytes and not 4 ? In this case, why not to store data directly in 4 bytes since it is the depth of the bus ?