Ascientist studies a model of a widely accepted theory about the universe. the model would most likely the scientists to

As the whole universe can't be observed , a scientist who studies a model which is an adaption of a widely accepted theory about the universe, the scientist would be able to understand the facts related to universe which can't be observed easily.

For example- the most accepted theory about the universe is the Big-Bang theory which states that the universe is continuously expanding and its temperature is decreasing. We cannot experience or observe the expanding procedure physically, so a model explaining this concept would help the scientist in understanding these facts more easily.

l dont know l am s sorry

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.