Iron oxide formula Fe<sub>2</sub>O<sub>3 </sub>how many molecules of Fe<sub>3</sub>O<sub>3 </sub>there in (5x<sup>2</sup>) mol of Fe<sub>2</sub>O<sub>3</sub>, if x=4?

Md Ariful Islam

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Md Ariful Islam

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3.21 * 1025 molecules

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Which of these atoms has the largest number of neutrons in the nucleus? (a) <sup>148</sup>Eu (b) <sup>157</sup>Dy (c) <sup>149</sup>Nd (d) <sup>162</sup>Ho (e) <sup>159</sup>Gd

d,e

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1. Calculate the pH of the solution with (H<sup>+</sup>)= 1.0 x 10<sup>-3</sup> 2. Calculate the pH of the solution with (H<sup>+</sup>)= 3.6 x 10<sup>-5</sup>

pH= -log[H+]pH= -log[1Γ—10^-3]pH= 32) pH= -log[3.6Γ—10^-5]pH= 5-log3.6pH= 4.44

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If AgCN is added to water it found however, that 1 liter of solution contains x mole of AgCN, the solubility product is a) 4x<sup>3 </sup>b) x<sup>2</sup> c) x<sup>4</sup> d) 27x<sup>5</sup>

a) 4x3

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2 Fe<sup>+2</sup>(aq) + H<sub>2</sub>O<sub>2</sub>(aq) ---&gt; 2Fe<sup>+3</sup>(aq) + 2 OH<sup>-1</sup>(aq) What is the oxidation state of oxygen in H<sub>2</sub>O<sub>2</sub>

Oxidation state of oxygen in H2O2.Since hydrogen has an oxidation state of +1Then we'll be having;(1)2+O2=02 + O2 = OThen bringing the constant to the right side have;O2 = -2...

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Derive 𝛂<sub>H3PO4,</sub>𝛂<sub>H2PO4</sub><sup>-</sup>, 𝛂<sub>HPO4</sub><sup>2-</sup>, and 𝛂<sub>PO4</sub><sup>3-</sup> expressions in terms of Ka and hydronium ion concentration.

𝛂H3PO4= 1Γ—10ph= 1Γ—106

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<sup>?</sup><sub>?</sub>? +<sup>14</sup><sub>7</sub>N β‡’ <sup>17</sup><sub>8 </sub>O+ <sup>1</sup><sub>1</sub>H<sub> </sub>

147N+42He→178O+11H714N+24He→817O+11H is an example of a fission reaction

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Electron Pair Geometry of: <ol><li>H<sub>2</sub>Se</li><li>PCl<sub>4</sub><sup>+</sup></li><li>NO<sub>2</sub><sup>-</sup></li><li>BrF<sub>3</sub></li><li>I<sub>3</sub><sup>-</sup></li></ol>

1.Bent with asymmetric charge distribution on the central atom. 2.Tetrahedral3.Trigonal planar

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Identify the 4 quantum numbers from the given electronic configurations a. 3p<sup>3</sup> b. 5p<sup>5</sup> c. 4s<sup>2</sup> d. 3p<sup>1</sup>

Energy (n), angular momentum (β„“), magnetic moment (mβ„“), and spin (ms).

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A container of 10 litres has a volume expressed in m<sup>3</sup> A. 1m<sup>3</sup> B. 0.01m<sup>3</sup> C. 0.001m<sup>3</sup> D. 0.0001m<sup>3</sup>

1 cubic metre =1000 litres10l = 1Γ—10/1000 = 0.01B. 0.01m3

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(NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> + H<sub>2</sub>SO<sub>4</sub> β†’ (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> + CO<sub>2</sub> + H<sub>2</sub>O net ionic equation

2 NH4 + + CO3 -2+ 2H + +SO4 2-= 2 NH4 + +SO4 2-+ CO2+H2O2NH4++CO3βˆ’2+2H++SO42βˆ’=2NH4++SO42βˆ’+CO2+H2O

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