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  1. 首先,解條題目: 34g的zine suplphate 於75cm^3的水內,那此溶液的濃度是多少? in 'M' = 濃度單位 moles per cubic decimeter = mol dm ^-3 = Molar 統稱 到高程度時,濃度= M, uM, nM etc...M=1000uM 等. 但你這裡唔駛用. 首先知道zine suplphate...

    分類:科學及數學 > 化學 2007年03月24日

  2. de Brogie wavelength = 6.63x10^-34/square-root[2 x 50x10^3 x 1.6x10^-19 x 9.1x10^-31] m = 5.49x10^-12 m Incident angle = 50/2 deg = 25 deg Hence, 2d.sin(25) = 5.49 x 10^-12 where d is the atomic plane spacing d = 6.5 x 10^-12 m 2013-10-22 23:13:20 補充: Your suppl question. It...

  3. The answer is : A. MgCO3 CaCO3­ and all the metallic carbonates in the four options have similar chemical formulae MCO3. 100 g pure CaCO3 + excess HCl → 44 g CO2 +other products 100 g impure...

    分類:科學及數學 > 化學 2012年07月28日

  4. Consider the original alkali: pH = 12 pOH = 14 - pH = 14 - 12 = 2 [OH-] = 10-pOH = 10-2 = 0.01 M Consider the diluted solution: It is diluted into 2%. [OH-] = 0.01 x 2% = 0.0002 M pOH = -log...

    分類:科學及數學 > 化學 2008年06月19日

  5. (commercial vinegar) 1. Consider the titration: CH3COOH + NaOH → CH3COONa + H2O No. of moles of NaOH used = MV = 0.2 x (20/1000) = 0.004 mol No. of moles of CH3COOH = 0.004 mol Volume of...

    分類:科學及數學 > 化學 2008年05月04日

  6. no. of mole of EDTA = (27.32/1000)x0.00396 = 1.08187X10^-5 no. of mole of Mg2+ = 1.08187X10^-5 no. of mole of Mg2+ in the 2L sample = 1.08187X10^-5 X (2000/10) = 2.13X10^-3 Conc. = 2.13X10^-3 / 2 = 1.082X10^-3...

    分類:科學及數學 > 化學 2008年07月16日

  7. You assumed thatthe monoprotic acid is completely dissociated to give the hydrogen ions. However, the pH value shows that it is not completely dissociated. pH = -(Log[H ]), so 2.69 = -(log [H ]) and...

    分類:科學及數學 > 化學 2008年05月25日

  8. Please read: 圖片參考:https://s.yimg.com/rk/HA00430218/o/1876360956.png

    分類:科學及數學 > 數學 2014年05月16日

  9. (c) The heat gain by the dripping water in 1 sec = (20/1000)x 4200 x T where T is the rise in temperature of the water, and 4200 J/kg-K is the specific heat capacity of water Heat generated by the drill = 2500 x 0.6 J/s The temperature of the...

  10. 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