A very simple assumption for the specific heat of a crystalline solid is that each vibrational mode of the solid acts independently and is fully excited and thus cv=3NAkB=24.9 kJ/(kmolā K). This is called the law of Dulong and Petit. Calculate the Debye specific heat (in units of kJ/(kmolā K) of diamond at room temperature, 298 K. Use a Debye temperature of 2219 K.
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Chemistry, 21.06.2019 19:00
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Chemistry, 21.06.2019 20:30
The speed of light is around 6.706Ć10^8 miles per hour. what is the speed of light in units of miles per minute?
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Chemistry, 22.06.2019 08:00
Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when itās still hot? separation: filtration of precipitatewhy donāt we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesnāt recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and āsyntheticā salicylic acid is 151-154oc?
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Chemistry, 22.06.2019 12:30
A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml
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A very simple assumption for the specific heat of a crystalline solid is that each vibrational mode...
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