( Hess’s law ) Can you please help me with these questions I’ve uploaded part C
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Question
( Hess’s law )Can you please help me with these questions I’ve uploaded part C
And can you write two possible sources of error that could contribute to the perscent error.
Thank you.
A student is performing Part C and does not completely dissolve the NaOH pellets before acquiring the final temperature. How will this affect his value for AHR and his percent error calculations? 2. In a different experiment it is observed that 252 J of heat must be absorbed to raise the tem perature of 50.0 g of Ni(s) from 20.0°C to 31,4 °C. Calculate the specific heat of Ni in both J/g. C and cal/g. °C 3.
Explanation / Answer
2. If not all of NaOH has dissolved, dHneut would be lower than the actual value expected as the final temperature would be lower due to less amount of acid neutralized.
3. Specific heat of nickel = heat/mass x dT
= 252 J/50 g x (31.4 - 20.0)
= 0.442 J/g.oC
= 0.442 x 0.24
= 0.106 cal/g.oC
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