Answer:
The difference of "Mi Mochila" is that it's yours, the difference of "La Mochila" it's that is only one for example you can say can you pass me "La Mochila"
The diffrerence of "Una Mochila" is that it's only one and you can say can you buy me "Una Mochila"
The difference between "La Mochila and "Las Mochilas" is that "La Mochila it's only one and "Las Mochilas are more than one
Step-by-step explanation: