1)an unknown solution is heated from 25°c to 78°c. it has a mass of 3.98g. solve for the unknown variables. is the reaction endothermic, or exothermic? 2) over time a solution has a final temperature of -35°c, and a change in temperature of 5°c. what state of matter is the substance? is the reaction endothermic, or exothermic? 3) a frozen glass of water is placed in a freezer, and becomes 25°c colder than its original temperature. it has a volume of 23.8g. how much energy was converted? was this endothermic, or exothermic? 4) a 8g glass of water has evaporated and it’s content is floating in a locked container. when you find the container it is at 125°c, you begin to cool the container and then find a temperature of 105°c. what is the enthalpy of said rxn? 5) how much energy was used to convert 45g of water from a solid to a liquid?