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molar mass

# molar mass - Samuel Castrejon Period 1 Molar Mass of...

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Samuel Castrejon Period 1 12/4/11 Molar Mass of Calcium Lab Data For the first part of the Lab the equation Ca + 2HNO 3 → Ca(NO 3 ) 2 + H 2 was used to calculate the theoretical ∆H°rxn. The equation for ∆H°rxn was set up as the following [(∆H°ƒ Ca +2 (aq) ) + 2(∆H°ƒ NO 3 - (aq) )] - [2(∆H°ƒ H + (aq) ) + 2(∆H°ƒ NO 3 - )] after simplifying the numbers, the resulted theoretical was calculated to be -542.96 kJ/Mol. To find the experimental data, the following data was used: Time (sec) Temp (ºC) 0 21 30 22 60 24 90 30 120 32 150 35 180 36 210 36 Time (sec) Temp (ºC) 0 20 30 22 60 25 90 33 120 35 150 37 180 39 210 40 240 40 270 40

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q = ms∆t m =100g HNO 3 s = 4.184 J/g°C ∆t = 41-22°C 1q = 4.184J/g°C 1 kJ = 469.85 kJ (Experimental) .16 mol Ca used mol 1000 J mol The percent error was found to be |(469.85kJ/mol/ 542.96kJ/mol|) which was calculated to be 13.47% In part 2 of the experiment, the follow data was used: HNO 3 + NaOH → H 2 O + NaNO 3 M x V = moles NaOH 0.75g Ca = g = Molar Mass moles used mol After completing titration it was found that 213mL of .150 M NaOH was needed to tirate.
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molar mass - Samuel Castrejon Period 1 Molar Mass of...

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