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  1. 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

  2. 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

  3. Since when it is cooled down to the room temperature, the product has been condensed to liquid water. According to the given, no. of moles of water produced = 0.00083 moles which is equivalent to 0.015 g of water, i.e. 0...

    分類:科學及數學 > 化學 2007年05月31日

  4. 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

  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. when encountering this kind of question, break it down into shorter sessions. first, calculate everything you can immediately think of. no. of mole of nitrate ion in 100ml 2M NaNO3 solution = volume x (molarity of salt) x (no. of ion in 1 mole of salt) = (100/1000) x 2.00 x 1 = 0.2 mole no...

    分類:科學及數學 > 化學 2011年12月07日

  10. In an experiment, 10 g of KCl(s) was added to 100 cm³ of water. The mixture was thenstirred until all the KCl(s) dissolved. The temperature of the mixture was foundto drop by 5.5 degree Celsius. What is the...

    分類:科學及數學 > 化學 2011年06月19日