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chemistry lab
Title: chemistry lab
Category: Science & Technology
Details: Words: 1857 | Pages: 7.9 (approximately 235 words/page)
chemistry lab
Observations
Before Experiment:
· Barium Hydroxide. Ba(OH2) . 8H2O
- The barium hydroxide appeared to have a slight tint of blue giving it the appearance of an off white substance.
- The substance needed to be crushed or grinded down into finer pieces to allow for better reaction with the ammonium thyocyanate, NH4SCN.
- Therefore a mortar and pestle was used to grind down the barium hydroxide into finer pieces.
- When the substance came in contact with …showed first 75 words of 1857 total…
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…showed last 75 words of 1857 total…in temperature.
Given:
- Mass of water: 46.87 grams Q = (46.87)(4.18)(-10)
- Ti of the water 21.5 °C Q = - 1959.166 Joules
- Tf of the water 11.5 °C
- DT: 1O°C
- 4.03 grams of NH4 SCN(s)
- 10.04 grams of Ba(OH)2.8H20(s)
Calculating the heat of reaction (DHr)
DHr = -(Q/n) where “n” is the number of moles
DHr = -(1959.166/0.063) n=(mass / molar mass)
DHr = 31097.9 Joules / mole n=(4.8/76.2)
DHr =31.0979 Kilojoules / mole n=0.063 moles
The heat of reaction for this experiment is 31.0979 kilojoules per mole!
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