4. (3 pts) From the information below, determine the lattice enthalpy for MgBr2. Show allwork.AH/(kJ mol-¹)Sublimation of Mg(s)+148lonization of Mg(g)+2187 to Mg2+(g)Vaporization of Br₂(1)+31Dissociation of Br,(g)+193Electron gain by Br(g)-331Formation of MgBr₂(s)-524

Drawing the Born-Haber cycle:Summing up all the energies must give the formation enthalpy of…

Answered: 4. (3 pts) From the information below,…

Chemistry

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Chapter1: Chemical Foundations

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Consider the followity pairs succntly had infinced spectroscope Could me either which is which ми ·OH of moleculer. Staff 30 O V-7: 500
1). The susceptibility of FeCl₂ obeys the Curie-Weiss law over the temperature range 90 K to room temperature (293K), with 0 =48K. Its molecular susceptibility at room temperature is 1.475 1022 emu/Oe g mol). (Use: N= 6.022 x 1023 atoms/g-mol, KB= 1.38 × 10-¹6 erg/K) (a) Show that the effective magnetic moment is 5.4 µB. (b) Show that the value of J is 2.25. (c) At an applied field of 8000 Oe, what is the value of the molecular field at 0 °C ?
e teaching and le x .. Calendar m/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-... <ΔΗ° this question. Given the standard enthalpy changes for the following two reactions: X (1) 2Zn(s) + O2(g) → 2ZnO(s) (2) Zn(s) + Cl₂ (g) → ZnCl₂ (s) KJ + Submit Answer 8 more group attempts remaining what is the standard enthalpy change for the reaction: (3) 2ZnCl₂ (s) + O₂(g) → 2ZnO(s) + 2Cl₂ (g) ΔΗ° =? Retry Entire Group ΔΗ° - 696.6 kJ AH = -415.0 kJ == Previous Next
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A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53%. Calculate the 90% confidence interval for the mean of the the three data, assuming that (a) the only information about the precision of the method is the precision for the three data. (b) on the basis of long experience with the method, it is believed that s---->σ lindane. (c) If s=0.28 is good estimate of σ, how many replicate measurement should be made in order for the mean for the analysis of sample to be within 0.2% of the true mean 90% of the time.
For each case below, suggest a plausible formula of the type CnHxOyNz: (a) Nominal mass of M1 5 79; (M 1 1)/M1 5 5.9% (b) Nominal mass of M1 5 123; (M 1 1)/M1 5 6.1% (c) Nominal mass of M1 5 148; (M 1 1)/M1 5 7.4% (d) Nominal mass of M1 5 168; (M 1 1)/M1 5 12.5%
(1) (1) (0) к ОН ОН - (її) ОН H₂SO4 heat PBr3 PBr3 (ii) он х ОН Br (i) OsO4; N (ii) NaHSO3; H20 PB13 POCI 3 (i) Li (ii) Cul Br (ii) Br ОН Mg, Et20 2 МСРВА ОН CuLi Na ОН 0 MgBr PB13 О O Na 2 С O Na Br combine carefully then H3O+ O 0 OH сохрасс CrO3 H₂SO4 =0 ОН
Page 2 2. A 0.9527 g sample containing only KCI and CaCl2 yielded 3.9802 g of dried Hg2Cl2. Calculate the percent of each halogen compound in the sample. KCI = K* + CIr; CaCl2 = Ca2+ + 2C-; 2CI- + 2Hg* = Hg2Cl2 CI 35.453; K 39.0983; Ca 40.078; Hg 200.59
F Consider the retrosynthesis of the following target molecule. Provide at least two possible starting materials that could be used to prepare the target molecule. Select the compounds (plus reagents) that would be suitable starting materials for an efficient synthesis of the given target molecule. Select all that apply. 2 W S 0 X 0 JOH # BAI 3 OH + NaOMe x OH e Br + NaOMe d + conc. H₂SO4 and heat C C $ 4 r f % 5 V t 6.0 6 b Oll y h & 7 O n u * 00 8 j m 9 k O < 0 alt р
j. k. Br I. HI (2 equiv) :: S: Na+
(d) 0.56 M (NH4)2SO4 lons: NH3* NH4 SO,2- SO3 O 0,2- [cation*] = i [anion] = M ΣΣ
b Answered X Co. How to Ca x N NSU Logir x PeriodicTa x M Action Re x 0 mySigTau xG 4.25 ml to x NBA Final X G scientific c X + ow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=Dassignment-take [References] Silicon tetrachloride (SiCl4) and trichlorosilane (SIHCI3 ) are both starting materials for the production of electronics-grade silicon. Calculate the densities of pure SiCl4 and pure SIHCI3 vapor at 98°C and 665 torr. Density of SiCl4 vapor = g/L %D Density of SIHCI3 vapor = g/L Submit Answer Try Another Version 3 item attempts remaining Previous Next Email Instructor Save and Exit Cengago T

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4. (3 pts) From the information below, determine the lattice enthalpy for MgBr2. Show all work. AH/(kJ mol-¹) Sublimation of Mg(s) +148 lonization of Mg(g) +2187 to Mg2+(g) Vaporization of Br₂(1) +31 Dissociation of Br,(g) +193 Electron gain by Br(g) -331 Formation of MgBr₂(s) -524