Lone sear CHEM 1411 Exam 19, whichofthe following iPMameu acidis-soluton, A) HI

Question

Lone sear CHEM 1411 Exam 19, whichofthe following iPMameu acidis-soluton, A) HI a) HF C) HCI Ir 2s0 ml of methane, CH., effuses througch a small hole in 32 s, the time reqsired for the same voluse of belium to pass through the hole under the same condnions will be A) 2.0s B) 64 s C) 8 s D) 128 s E) 16s 21. What is the ratio of the average speed of He molecules to that of CIl, molecules at 298 KT A) 11:7 B) 2:3 D) 2:1 E) 3:2 22. What volume of ammonia gas, measured at 862.9 mmHg and 58.4C, is required to produce 8.84 g of ammonium sulfate according to the following balanced chemical equation? A) 0.802 L B) 3.21 L C) 000538 L D) 12.41 E) 0.00140 L 23. Given the thermocbemical equation find AH for the following reaction. 2A101) 4Al(s) + 302(g) A) 1676 k B) -838 kJ C) 3352 kJ D)-1676 kJ E) 838 kJ

Explanation / Answer

Q19

note that from all, HF will be so electronegative, that H-F will not dissociate 100%

therefore, all other are strong electrolytes, i.e. disociate 100%

HF will be weak acid

Q20

Apply graham law

Rate 1 / Rate 2 = sqrt/MW2/MW1)

time 2 / time 1 =  sqrt/MW2/MW1)

(t2)/(32) = sqrt(4/16)

t2 = 32* sqrt(4/16)

t2 = 16 s

Q21

Ratio of speeds:

RMS1 = sqrt(3*RT/MW1)

RMS2 = sqrt(3*RT/MW2)

RMS ratio = sqrt(MW2/MW1)

RMS ratio = sqrt(16/4) = 2

He is 2 times faster than CH4

1:2 so choose D

Related Questions

Navigate

• Browse (All)
• Browse L
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.