it will depend on its composition.
welcome to this gardening site. if you have any gardening related questions there will be lots of people to help.

Converting liters to kilograms requires knowing the specific gravity of the substance involved. In cases of very fine measurements, knowing the temperature is also necessary, since--with very few exceptions--the specific gravity goes down as the temperature goes up.
Welcome to GoY, Devendra, and good luck on your exam!

1 if it was water. Glue would be different.

Suggest you go to a shop that sells the kind of glue you're asking about and see if it gives the weight as well as the cubic capacity. Glues vary.