How many lone pair of electrons are present in c20

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!