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  1. Indeed, 1.000 faraday of charge refers to 1 mole of electrons, hence: No. of moles of ferrous ions that would be deposited = 1/2 mole, with mass = 1/2 x 55.8 = 27.9 g No. of moles of ferric ions that would be deposited = 1/3 mole...

    分類:科學及數學 > 化學 2010年11月01日

  2. 2c Your answer is correct, but the answer from the book is incorrect. Possible reason : Key in “6.5” instead of “63.5” when using the calculator. ========== 3e The answer from the book is correct, but your answer is incorrect. In...

    分類:科學及數學 > 化學 2007年08月27日

  3. Cu(s) + 4H+(aq) + 2NO3-(aq) --> Cu2+(aq) + 2NO2(g) + 2H2O(l) 2Cu(NO3)2(s) → 2CuO(s) + 4NO2(g) + O2(g) mole of CuO=31.8/(63.5+16)=0.4mol mole of Cu=0.4mol mass of Cu=25.4g percentage=25.4/28.5=89.1% 2007...

    分類:科學及數學 > 化學 2007年05月03日

  4. Chemical formula of hydrated sodium carbonate is Na2CO3·10H2O. Na2CO3·10H2O (s) → Na2CO3 (s) + 10H2O(l) Mole ratio of Na2CO3·10H2O : H2O = 1:10 Molar mass of...

    分類:科學及數學 > 化學 2007年02月22日

  5. Na₂CO₃ + 2HCl --> 2NaCl + CO₂ + H₂O no. of mole of Na₂CO₃ = 0.08x(15.6/1000) = 0.001248 no. of mole of HCl remains in 25 cm³ diluted solution = 0.001248x2 = 0.002496 no. of mole of HCl remains in 25...

    分類:科學及數學 > 化學 2013年11月17日

  6. 1) 25 cm³ of HxA reacts with 25 cm³ of 0.2M NaOH to give Na2A. Find the molarity of HxA. HxA + xNaOH → NaxA + xH2O Since NaxA is Na2A, x = 2 H2A...

    分類:科學及數學 > 化學 2011年05月01日

  7. 1.According to the equation, the theoretical yield of NO gas are 2X2/3 moles when 2 moles Copper is completely consumed. so The theoretical yield of NO gas is 2x2/3x28=37.3grams the answer is 37g 2.192x4x27/102=203...

    分類:科學及數學 > 化學 2010年09月06日

  8. 1. mole of carbon 85.7/12=7.14166... mole of hydrogen 14.3/1=14.3 divided by smaller number carbon: 7.141666.../7.14666...=1 hydrogen: 14.3/7.14166...=2 empirical formula is C1H2 sodium hydroxide can absorb CO2 remaining gases occupied 60.0...

    分類:科學及數學 > 化學 2012年03月26日

  9. 1) 0.936 g of a natural limestone was heated strongly to give quick lime (CaO) and CO2. The volume of CO2 collected at r.t.p. was 200 cm³. Find A) the mass of quick lime formed. B) The percentage of...

    分類:科學及數學 > 化學 2010年06月14日

  10. Q1) The solutions are diluted in mixing. After mixing : [Pb(NO3)2]o = 0.3 x (20/50) = 0.12 M Hence, [Pb2+]o = 0.12 M [FeCl3]o = 0.4 x (30/50) = 0.24 M Hence...

    分類:科學及數學 > 化學 2007年06月20日