m When Fe0.930 is heated in presence of oxygen, it converts to Fe2O3. The number of correct statement/s from the following is mathongomathonga mathonga A. The equivalent weight of Fe0.930 is Molecular weight mathongy mathongu mathongs m 0.79 B. The number of moles of Fe2+ and Fe3+ in 1 mole of Fe0.930 is 0.79 and 0.14 respectively. C. Fe0.930 is metal deficient with lattice comprising of cubic closed packed arrangement of O2 ions. 14. mathongo mathong mathongom D. The % composition of Fe2+ and Fe3+ in Fe0.930 is 85% and 15% respectively. mathongom

The reaction of 55.8 g sample of iron (Fe) metal with 1.00 mol of oxygen gas is described by the following reaction equation: 4Fe(s) + 3O2(g) → 2Fe2O3(s) Calculate the energy that is released through this reaction based on the quantities of reactants combined. The standard enthalpy of formation, ΔfHϴ, of Fe2O3 is −826 kJ mol–1. (A) 206 kJ (B) 413 kJ (C) 826 kJ (D) 1650 kJ (E) 1101 kJ

he excess partial molar free energy of iron at 1600°C (1873 K) in Fe-Ni solutions atdifferent compositions isgiven below. xNi lÇ9 : 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 cal/mole : 0 -15 -40 -90 -260 -620 -1330 -2030 -2730 deg/mole: 4.56 2.87 2.20 1.84 1.42 1.04 0.72 0.44 0.21 (^Fe> J//mot : ° ~6Z ~16? ~Z7? ~1088 ~2594 ~5566 ~8494 ~11422) Calculate the excess partial molar free energy of nickel in an equi atomic solution.

What is the correct formula for iron(III) oxide?Group of answer choicesFe2O3Fe3OFeO3FeOFe3O2

We noted in Section 12.5 (Figure 12.20) that in FeO (wüstite), the iron ions can exist in both Fe2+ and Fe3+ states. The number of each of these ion types depends on temperature and the ambient oxygen pressure. Furthermore, we also noted that in order to retain electroneutrality, one Fe2+ vacancy will be created for every two Fe3+ ions that are formed; consequently, in order to reflect the existence of these vacancies the formula for wüstite is often represented as Fe(1 – x)O, where x is some small fraction less than unity. In this nonstoichiometric Fe(1 – x)O material, conduction is electronic, and, in fact, it behaves as a p-type semiconductor—that is, the Fe3+ ions act as electron acceptors, and it is relatively easy to excite an electron from the valence band into an Fe3+ acceptor state, with the formation of a hole. Determine the electrical conductivity of a specimen of wüstite that has a hole mobility of 1.0 × 10–5 m2/V.s and for which the value of x is 0.040. Assume that the acceptor states are saturated (i.e., one hole exists for every Fe3+ ion). Wüstite has the sodium chloride crystal structure with a unit cell edge length of 0.437 nm.

2.4 g of magnesium metal reacted vigorously when heated with excess iron(III) oxide, Fe2O3, according to the following equation:3Mg(s) + Fe2O3(s) → 2Fe(s) + 3MgO(s) Determine the mass of solid iron produced in the reaction.