Question

Maria is baking cookies. She mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of her ingredients. The mixture has a mass of 1053 grams. Maria baked the cookies for 15 minutes and then measured the mass of the cookies and found they now had a mass of 845 grams. Why didn't the cookies obey the law of conservation of mass?

The law of conservation of mass was not obeyed since some of the mass was destroyed in the baking process.

The law of conservation of mass was not obeyed since Maria did not measure the mass of all of the ingredients.

The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.

The law of conservation of mass was not obeyed since some of the mass was destroyed in the oven.

Answer 1

The answer is "the law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking."

Step-by-step explanation:

Answer 2

The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.

Step-by-step explanation:

Maria mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of her ingredients.

Initial mass of ingredients = 1053 g

Final mass = 845 g

All these information are not of any great help.

Law of conservation of mass states that:

For any system closed to all transfers of matter and energy, the mass of the system can not change with respect to time, as system's mass cannot change, any mass can neither be added nor be removed.

In this process of baking, considering the cookies as our system, they never formed a closed system. Hence were free for evaporation.

During the process of baking, water from dough must have evaporated and mass must have reduced.

Hence, the law of conservation of mass was not obeyed.