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?
group of answer choices

Cookies definitely obeys the law of conservation.`

Explanation:

As, When Maria mixes up the ingredients, Water was also one among them

And, Initially When she was measuring the weight of Ingredients, Weight of Water was coming,

But,

 When She baked the cookies , water from the cookies got evaporated , and thus weight coming was decreased finally.

Considering Cookies and Environment Whole as a system You can clearly say  that they obeys Law of conservation of mass , As Water is present in Environment for now.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

let that person have a turn to speak : )