更新1: [△Hf/kJmol-1: BaO(s): -997.5; BaCO3(s): -1218.8; CO2(g): -393.5; C2H4(g): +52.3; C2H6(g): -84.6; C2H5Br(l): -92.0; C2H5OH(l): -277.7; HBr(g): -36.2; H2O(l): -285.9; H2SO4(l): -814.0; MgCl2(s): -641.8; TiCl4(l): -...
From a calculated value of S°(CH3COCH2Br,g,298 K) = (84.2 ± 2) cal K1mol1 and the experimental equilibrium constants, the 'third-law method' yields ΔH°f(CH3COCH2Br,g,298 K) = (43 ± 2.0) kcal mol1 (using an estimated 〈ΔC°p〉 = (1.3 ± 1) cal K1 mol1)§ Bromo...
Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2HBr(g) + Cl2(g)2HCl(g) + Br2(g) Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2Na(s) +...
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As another example, the enthalpy of formation of water can be obtained by burning H2 in oxygen H2(g)+12O2(g)=H2O(1)ΔcHc=ΔfHm∘=−285.830kJ·mol−1. One must be careful to indicate the physical state of the compound. For example, the enthalpy of formation of H2O(g) is given...
View Solution Given, H2(g)+Br2(g)→2HBr(g),ΔH01 and standard enthalpy of condensaion of bromine is ΔH02, standard enthalpy of formation of HBr at 25∘C is View Solution KVPY PREVIOUS YEAR-MOCK TEST 8-EXERCISE Low spin complex of d^6-cation in an octahedral field will have the...
化學加成律 addition law of thermochemistry。其實不只反應熱遵循黑斯定律,所有伴隨化學反 應所發生的能量變化都遵守黑斯定律,自由能以及亂度也都可以相加減。 標準生成熱 standard heat of formation 由於實驗只能測量熱能變化量,無法測量某個物質的熱含量,所以必須有一個公定的基 準來作參照。化學家們約定,...
Draw a potential energy diagram for the formation of NO2(g). N2(g) + 2O2(g) arrow 2NO2(g); Delta Hrxn = 66.2 kJ/mol Label the graph with reactants, products, Delta Hrxn, and Ea. Draw the energy diagram of a two-step endergonic...
ChemInform Abstract: PREPARATION, CRYSTAL STRUCTURE AND ENTHALPY OF FORMATION OF DICESIUM HEXABROMONEPTUNATEneptunium, NpCS 2 NpBr 6 fllt beim Einleiten von HBr in eine salpetersaure Lsung von Np(IV) und Cs′ mikrokristallin aus.doi:10.1002/chin.197803039...
Utilization of k 1 in a third law procedure has provided the standard enthalpy of formation value ofD f H ° 298 (CH 3 CO ) = -10.04 ± 1.10 (2σ) kJ mol -1 in excellent agreement with a very recent IUPAC recommendation.doi:10.1007/s11144-005-0332-0Gergely Kovács...