Using the data in the table below and the enthalpy of reaction, AH°, calculate the approximate bond energy of the nitrogen-hydrogen bond in ammonia. Ixn³ Approximate Bond Energy (kJ mol") Bonds N FH ??? H-H 430 NEN 960

Select one for each box

Ctrl Caps Shift M Inbox (1,543)-ftantill@udeledu x Mail-Francesca A Tantillo-Out x Homepage-CHM150-251 Chen X ← C - с app.101edu.co Question 19 of 20 Vitamin C (ascorbic acid, CeHsO6, 176.12 g/mol) can be measured by redox titration with iodine solution. lodine is reduced to iodide ion, while ascorbic acid is oxidized to dehydroascorbic acid (C6H6O6). The iodine solution is usually made in the presence of iodide ion, forming the more stable triiodide ion, Is, giving the following overall reaction CeHsOc(aq) + Is (aq) + H₂O(1)→ CHO(aq) + 31-(aq) + 2H+(aq) The titration is carried out in the presence of starch, which forms a dark blue complex with the excess iodine when the endpoint is reached. Ascorbic acid can be used to standardize the iodine solution. A 0.315 g sample of ascorbic acid was titrated with iodine solution, requiring 30.2 mL to reach the endpoint. Calculate [ls], the molar concentration of Is ion in the solution. O L Tab En Esc 79°F Sunny ! 1 Q A N FI @ 2 W S F2 X # 3 E D…

Trial 1 Trial 2 Trial 3 Initial burette reading (mL) 2.29   1.41   1.95   Molarity of NaOH (M) 0.100   0.100   0.100   Volume of vinegar sample (mL) 5.00   5.00   5.00   Final burette reading (mL) 50.37   49.39   49.84 Table 2. Titration data   Trial 1 Trial 2 Trial 3 Initial burette reading (mL) 2.29   1.41   1.95   Molarity of NaOH (M) 0.100   0.100   0.100   Volume of vinegar sample (mL) 5.00   5.00   5.00   Final burette reading (mL) 50.37   49.39   49.84   Expected color at end point       Volume of NaOH used (mL) 48.08   47.98   47.89  Compute for the ff: a.   Average moles of acetic acid (mol)? b.  Average molarity of acetic acid (M)? c.  Average molarity of acetic acid (M)?

7. Don believes that fewer than one-third of the students at his college hold part-time jobs while in school. To investigate this, he randomly surveyed 116 students and found that 32 students held part-time jobs. a. ( - Provide a 90% confidence interval for the population proportion of students that hold a part-time job. b. 1 (a). ;Give the correct interpretation of the interval in part c. Extra Credit: Does this interval support Don's claim? Why?