I need help understanding #3, 6, and 7. Thank you so much!! EXPERIMENT 2 PRE-LAB

Question

I need help understanding #3, 6, and 7. Thank you so much!!

EXPERIMENT 2 PRE-LAB QUESTIONS (20 points Stoichiometry and Thermochemistry 1 There are three possible unknowns for this experiment Wnte balanced chemical equations for the reaction of cach of these unknowns with sodium hypochlonte (3 points) Na, S,0, + 2 If the stoichiometric ratio of your reaction were 1:1, what volumes of hypochlorite and your unknown would you use to get the highest temperature possible? What if it were 314:1 (Hint Remember the total volume will be 10 mL)(3 points 3. If the stoichiometric ratio of your reaction were 1.1 what volumes would you use to collect four data points on either side of the highest temperature (stoichiometric ratio)? What if it were 3.1? 4:1? (3 points) Finally, if you didn't know what the stoichiometric ratio of hypochlorite and your unknown was, what would be your approach? What combination of volumes could you use to deter mine the ratio between the hypochlorite ions and your unknown? (2 points) 4. Try dHXvent volumes Uni:) there If you combine 3 mL of water at 22°C and 7 mL of water at 24 C, what would the initial tenm perature of the solution be? (Hint Find the weighted average.) (2 points) 5. 3mL 003L @245K mL,U0@24K When would you need to measure the temperature in each trial in order to calculate the change in temperature (AT)? (2 points) 6. 35

Explanation / Answer

3.

Point

NaOCl Volume/(ml)

Unknown Volume/(ml)

1

10*0.25=2.5

10*0.75=7.5

2

10*0.50=5

10*0.50=5

3

10*0.75=7.5

10*0.25=2.5

4

10*0=0

10*1=10

6.Initial temperatures of reactors and the temperature after mixing them.

7.

2NH3+3NaOCl    N2+3H2O+3NaCl

Volume of NaOCl=50*3/5=30ml

Volume of Ammonia=50*2/5=20ml

Ratio of NaOCl :Ammonia= 3:2

Volume of N2 =10ml

Point

NaOCl Volume/(ml)

Unknown Volume/(ml)

1

10*0.25=2.5

10*0.75=7.5

2

10*0.50=5

10*0.50=5

3

10*0.75=7.5

10*0.25=2.5

4

10*0=0

10*1=10

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