3. Why LY INIT A BC What's More Directions: Arrange the phases of the menstrual cycle in alphabetical order from A-J. Write your answer on your answer sheet. 1. The process of fertilization may take place. 2. A new egg cell starts to mature within the ovary. 3. The lining of the uterus becomes thin after bleeding. 4. The mature egg travels from the ovary to the uterus. 5. Uterine linings begin to break down and bleeding results. 6. An egg in the ovary continues to mature. 7. The endometrium or lining of the uterus becomes thicker in preparation for the implantation of the fertilized egg. 8. The mature egg is released. 9. The mature egg moves to the surface of the ovary just before mid- cycle. 10. The next menstrual-cycle is then about to begi.

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

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol