Physics, 23.07.2019 21:30 jahjah1158

Calculate the value of δs when 64.0 g of ga(l) solidifies at 29.8 ∘c.

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Answer from: eyebang

The variation of entropy of a substance is given by
$\delta S = \frac{\delta Q}{T}$ (1)
where
$\delta Q$ is the heat exchanged in the process
T is the absolute temperature at which the transformation occurs.

The process in the problem is the solidification of the liquid Gallium, which releases an amount of heat equal to:
$\delta Q = m L_f$
where m is the mass of the substance and L_f = 80.1 J/g

is the latent heat of fusion of Gallium. Using m=64.0 g, we find
$\delta Q= m L_f = (64.0 g)(80.1 J/g)=-5126.4 J$
where the negative sign means the Gallium is releasing heat to the environment.

Now we can use equation (1) to find the variation of entropy, but first we need to convert the temperature into Kelvin:
$T=29.8^{\circ} + 273.15 = 302.95 K$

And so the variation of entropy is
$\delta S = \frac{\delta Q}{T}= \frac{-5126.4 J}{302.95 K}=-16.92 J$
and the negative sign means the entropy in the process is decreasing.

Answer from: Quest

Acetic acid /əˈsiːtɪk/, systematically named ethanoic acid /ˌɛθəˈnoʊɪk/, is a colourless liquid organic compound with the chemical formula ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called glacial acetic acid. vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to polyvinyl acetate and cellulose acetate. it is classified as a weak acid since it only partially dissociates in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7 3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366 chemblchembl539 chemspider171 drugbankdb03166 echa infocard100.000.528ec number200-580-7e numbere260 (preservatives)gmelin reference1380iuphar/bps1058keggd00010 meshacetic+acidpubchem cid176rtecs numberaf1225000uniiq40q9n063p un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4) key: qtbsbxvteameqo-uhfffaoysa-n smilescc(o)=o

Answer from: Quest

Then the answer would be d then

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Calculate the value of δs when 64.0 g of ga(l) solidifies at 29.8 ∘c....

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