A50.0-g sample of liquid water at 25.0â°c is mixed with 35.0 g of water at 57.0â°c. the final temperature of the water is â°c.

35.1 degrees Celsius 

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom