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lana [24]
3 years ago
14

Please following me in the branily app ~♥~​

Chemistry
2 answers:
Bas_tet [7]3 years ago
8 0

Answer:

\huge\colorbox{pink}{✏﹏ \: BlackPink\: }

Omg!!!!! BlackPink!!!!!

# Blinkeu~~ ♡

Nonamiya [84]3 years ago
3 0
If their was a follow button on a profile why not I would but their isn’t sooo I mean I’ll follow these convos so what’s up hope everyone having a good day :)
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1. The heat of fusion for the ice-water phase transition is 335 kJ/kg at 0°C and 1 bar. The density of water is 1000 kg/m3 at th
vodomira [7]

Answer:

Expression for the change of melting temperature with pressure..> T₂ = T₁exp(-(P₂-P₁)/(3.61x10⁹ Pa), Freezing Point = 0°C

Explanation:

Derivation from state postulate

Using the state postulate, take the specific entropy,  , for a homogeneous substance to be a function of specific volume  and temperature  .

ds = (partial s/partial v)(t) dv + (partial s/partial T)(v) dT

During a phase change, the temperature is constant, so

ds = (partial s/partial v)(T)  dv

Using the appropriate Maxwell relation gives

ds = (partial P/partial T)(v) dv

s(β) – s(aplαha) = dP/dT (v(β) – v(α))

dP/dT = s(β) – s(α)/v(β) – v(α) = Δs/Δv

Here Δs and Δv are respectively the change in specific entropy and specific volume from the initial phase α to the final phase β.

For a closed system undergoing an internally reversible process, the first law is

du = δq – δw = Tds - Pdv

Using the definition of specific enthalpy, h and the fact that the temperature and pressure are constant, we have

du + Pdv = dh Tds,

ds = dh/T,

Δs = Δh/T = L/T

After substitution of this result into the derivative of the pressure, one finds

dp/dT = L/TΔv

<u>This last equation is the Clapeyron equation.</u>

a)

(dP/dT) = dH/TdV => dP/dlnT = dH/dV

=> dP/dlnT = dH/dV = [H(liquid) - H(solid)]/[V(liquid) - V(solid)]

= [335,000 J/kg]/[1000⁻¹ - 915⁻¹ m³/kg]

= -3.61x10⁹ J/m³ = -3.61x10⁹ Pa

=> P₂ = P₁ - 3.61x10⁹ ln(T₂/T₁) Pa

or

T₂ = T₁exp(-(P₂-P₁)/(3.61x10⁹ Pa)

b) if the pressure in Denver is 84.6 kPa:

T₂(freezing) = 273.15exp[-(84,600-100,000)/(3.61x10⁹)]

≅ 273.15 = 0°C T₁(freezing) essentially no change

5 0
3 years ago
Sodium has the atomic number 11. How many electrons are in a sodium ion, which has the symbol Na+? 10 11 12 NextReset © 2017 Edm
Anna71 [15]
Na 1s²2s²2p⁶3s¹
↓ - e⁻
Na⁺ 1s²2s²2p⁶    2+2+6=10 e⁻

10 electrons are in sodium ion Na⁺
4 0
3 years ago
The temperature of a boiling liquid can rise above its boiling point.<br> a. true<br> b. false
goldenfox [79]
The temperature of a liquid can exceed its boiling point. An example is water. Although at ordinary pressure of 1 atm, the boiling point is 100 degrees, water can still exist in higher temperatures but this time in another state. Superheated steam is the term used for water whose temperature has higher than the boiling point
5 0
3 years ago
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Which of the following is not the same as 12.5 millimeters
jek_recluse [69]
I got <span>0.00125 hm . Hope I helped, and good luck(: </span>
5 0
3 years ago
(01.04 MC)
iogann1982 [59]
I turned in this exact assignment today haha

the blood vessels dilate to draw body heat away from the body and towards the surface of the skin
sweat glands release sweat, when sweat evaporates it releases heat
6 0
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