You have 5,00 g Zn. How many mol OH- do you have?
Can someone show me how to do it?

Alily leaf is a plant whereas a cat is an animala lily leaf cell is a plant cell and a skin cell is an animal cell

Sorry im just trying to get answers like you are 

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.