What is the molecular formula of ethane, a hydrocarbon that is 80.0% carbon and 20.0% hydrogen by mass

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

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Stage in which a typical star has completely stopped fusion