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Сoding to search: 3 As2S3 + 28 HNO3 + 4 H2O = 6 H3AsO4 + 9 H2SO4 + 28 NO Add / Edited: 25.12.2014 / Evaluation of information: 5.0 out of 5 / number of votes: 1 The compound Al2S3 involves the transfer of 6 electrons. 3 + x - 8 = 0-5 +x = 0. x = +5 1 Answer Edmund Liew Dec 12, 2016 Let me help you write up the equation more clearly, first. This can be done by oxidation number(O.N) method Findind the O.N of each atom in reactant and product: In NO3- , O.N of N= +5 and of O= -2 In As2S3 , O.N of As= +3 and of S= -2 In (AsO4)3- ,O.N of As= +5 and of O= -2 In (SO4)2- , O.N of S= +6 and of O=-2 In NO , O.N of N= +2 and of O= -2 Calculate the increase and decrease in O.N with respect to reactant atoms As2S3==> (AsO4)3- … Al has an oxidation number of +3. In the oxidation number change method the underlying principle is that the gain in the oxidation number (number of electrons) in one reactant must be equal to the loss in the oxidation number of the other reactant. The oxidation number of each atom can be calculated by subtracting the sum of lone pairs and electrons it gains from bonds from the number of valence electrons. Different ways of displaying oxidation numbers of ethanol and acetic acid. The more common oxidation numbers are in color.The oxidation number +3 is common to all lanthanides and actinides in their compounds. The oxidation number of Al is +III and S is -II. let x = oxidation number of As ( 3 x 1) + x + [ 4 (-2)]=0. Step 1 : To identify the atoms whose oxidation number have undergone a change . Step-1: To identify the atoms whose oxidation numbers have undergone a change. The number of electrons in each of arsenic's shells is 2, 8, 18, 5 and its electron configuration is [Ar] 3d 10 4s 2 4p 3 . in compounds oxygen is generally assigned oxidation number of -2. for neutral species the sum of the oxidation numbers times the number of wach kind of atoms adds up zero. in compounds hydrogen is generally assigned oxidation number of +1. and sulfur -2 The general idea is that electrons are transferred between charged atoms. Step-2: Oxidation: [As, from +3 to +5 i.e., 2 unit change, S from to O also 2 in change] Reduction: Step-3: To balance the oxidation half Eq. balance the following reactions both by oxidation number method and ion electron method 1 as2s3 no3 h gives aso43 s no2 h2o 2 h2s fe3 fe2 s h 3 zn no3 - Chemistry - TopperLearning.com | kvwc42ww Periodic table of the elements; ... Balance the equation with the ARS method → As2S3 + KClO3 = KH2AsO4 + H2SO4 + KCl. Figure 1. The oxidation number method is a way of keeping track of electrons when balancing redox equations. Chemistry Electrochemistry Balancing Redox Equations Using the Oxidation Number Method. ARSENIC TRISULFIDE is dissolved by alkalis and by hydrochloric acid (slowly). Here's how the oxidation number method works for a very simple equation that you could probably balance in your head. As2S3 + K2Cr2O7 + H2SO4 = H3AsO4 + K2SO4 + Cr2(SO4)3 + H2O + SO2. writing the oxidation number of each atom above its symbol , we have + 3 − 2 A s 2 S 3 + + 5 N O 3 − ( a q ) + H + + 5 A s O 4 3 − ( a q ) + 0 S ( g ) + + 2 N O 2 ( g ) + H 2 O ( l ) Arsenic (atomic symbol: As, atomic number: 33) is a Block P, Group 15, Period 4 element with an atomic radius of 74.92160. Bonds between atoms of the same element (homonuclear bonds) are always divided equally. (i) Writing the oxidation number of each atom above its symbol, we have. 