When 1988 J of heat energy is added to 47.4 g of ethanol, C2H6O6, the temperature increases by 17.1 degrees Celsius. how is the molar heat capacity of C2H6O calculated?

1 Answer
Jane
Feb 10, 2018

If a substance of mass #m# and specific heat of #s# increases its temperature by #d theta# ,due to addition of #H# amount of heat,then,

#H=ms d theta#

Given, #H=1988J,m=47.4,d theta=17.1 degree C#

So, #s=1988/(47.4×17.1)=2.47 Jgm^-1degreeC^-1#

Now,#47.4 gm# of ethanol means #47.4/46# i.e #1.03# moles

So,molar heat capacity will be #2.47/1.03 =2.4 J mol^-1 degree C^-1#

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