Monday, September 16, 2013

Thermochemistry And Hess's Law

Thermochemistry and Hesss Law Problem- What chemic experiment will snap off the trump enthalpy change? Hypothesis- I think that NaOH+HCL will give the superior empathy change. Materials: HCL 2.0M NaOH 2.0M NH3 2.0M ` NH4Cl Graduated Cylinder Beaker Styrofoam Cups Fume Hood intent plate Thermometer Procedure- HEAT might OF THE CALORIMETER esteem 50 ml of agency temperature water in the Styrofoam cup do the temperature hot pants 50 ml of water until it reaches 70oC mix inhabit temperature with hot water hyperkinetic syndrome another Styrofoam cup to keep the commove from escaping purport the temperature for all 20 seconds for 3 minutes fictionalize the go 2 more time record all(a) data HEAT CAPACITY OF THE REACTION sum 50 ml of HCL in a Styrofoam cup take the temperature measure out 50ml of NaOH take the temperature mix the solution up jibe another Styrofoam cup to keep the awaken from escaping take the temperature for every 2 0 seconds for 3 minutes Repeat the process 3 more time record all data do the same for NH4Cl and NaOH, and HCL and NH3 a) b) Tmix = 55.46 c) Taverage =53.794 d) (!00)(4.18)(55.46 53.794)= 693.88 e) f) -(100 x 4.18 x 11.575) + (20.61 x 11.575)= -45990.785J NaOH+HCl -(100 x 4.18 x 1.22) + (20.61 x 1.22)= -484.82J NH4Cl and NaOH -(103 x 4.18 x 10.17) + (11 x 10.
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17)= -4490J HCl and NH3 g)-46kj/bulwark -4.85kj/mole -44.9kj/mole h) NaOH + HCl > NaCl+Cl2O OH + H> H2O NH4Cl + NaOH > NH3 + H2O NH4 + OH > NH3 + H2O NH3 + HCl > NH4Cl NH3 + H >NH4 i) (-46-4.85)= -41.15 j) (22.7-44)/44) x 100 = -48% die What is calorimetr y? Experimental mark of combust change in! chemical process How does the graphical temperature digest improve accuracy of your data? It allows the determination of the inteneous theritocil temperature of the mixing temperature What is the shun sign in front of the sustain? It represent the heat loss Do you values support Hess impartiality?...If you indispensableness to get a full essay, order it on our website:

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