New Inner Tubes

I am still a novice, so bear with me here. I had my first flat the
other day and I changed it with the inner tube that the bike
shop gave me with the bike. Today I went to a bike shop to get a new inner tube and they sold me a Specialized Long Stem that
fits 700 X 20/28c. Now, my bike says that it has a 700 X 25c.
What is the difference and will it fit my bike?

Thanks in advance.

 

Yes no problem, the long valve stem is for the 'higher profile rims'.

Some tubes now sold fit from 700x18mm thro to 700x25mm inclusive. Look really thin section but easily expand out to 25mm width