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Charra [1.4K]
4 years ago
7

If you have a 1.0 m aqueous solution of NaCl, by how much will it increase the water’s boiling point, if KB = 0.512 °C/m? In oth

er words, what is the boiling point elevation (increase)?
Physics
1 answer:
fgiga [73]4 years ago
5 0

<u>Answer:</u> The elevation in boiling point is 1.024°C.

<u>Explanation:</u>

To calculate the elevation in boiling point, we use the equation:

\Delta T_b=ik_b\times m

where,

i = Van't Hoff factor = 2 (for NaCl)

\Delta T_b = change in boiling point  = ?

k_b = boiling point constant = 0.512^oC/m

m = molality = 1.0 m

Putting values in above equation, we get:

\Delta Tb=2\times 0.512^oC/m\times 1.0m\\\\\Delta Tb=1.024^oC

Hence, the elevation in boiling point is 1.024°C.

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Which process helps regulate Earth's climate by transporting warm seawater to colder regions of seawater?
telo118 [61]

Answer: A. Thermohaline circulation

Explanation:

The thermohaline circulation is a phenomena which involves the movement of the oceanic currents because of the differences that occur in the temperature and salinity of oceanic water. These two factors changes the salinity and density of the water and fluctuating the climatic conditions. Cold water is particularly denser than the warm water. The water with more salinity is also denser over water with less salinity. The deep oceanic water currents brings changes in the density as well as the salinity of water hence, the circulation of water is called as thermohaline circulation. Some part of warm water will evaporate from the surface layer of the ocean this will lead to the flow of warm wind currents and water to the regions of cold regions of the seawater.

On the basis of the above description, A. Thermohaline circulation is the correct option.

7 0
3 years ago
Read 2 more answers
An air bubble has a volume of 1.3 cm3 when it is released by a submarine 160 m below the surface of a freshwater lake. What is t
murzikaleks [220]

Answer:

V2 = 21.44cm^3

Explanation:

Given that: the initial volume of the bubble = 1.3 cm^3

Depth = h = 160m

Where P2 is the atmospheric pressure = Patm

P1 is the pressure at depth 'h'

Density of water = ρ = 10^3kg/m^3

Patm = 1.013×10^5 Pa.

Patm = 101300Pa

g = 9.81m/s^2

P1 = P2+ρgh

P1 = Patm +ρgh

P1 = 1.013×10^5+10^3×9.81×160.

P1 = 101300+1569600

P1 = 1670900 Pa

For an ideal gas law

PV =nRT

P1V1/P2V2 = 1

V2 = ( P1/P2)V1

V2 = (P1/Patm)V1

V2 = ( 1670900 /101300 Pa) × 1.3

V2 = 1670900/101300

V2 = 16.494×1.3

V2 = 21.44cm^3

4 0
3 years ago
A cylindrical rod of stainless steel is insulated on its exterior surface except for the ends. The steady-state temperature dist
Elina [12.6K]

Answer:

0.46786 W

Explanation:

The solution is in the attached file below

7 0
3 years ago
A toy helium balloon is initially at a temperature of T = 24o C. Its initial volume is 0.0042 m3 (It is a 10 cm radius sphere).
Anettt [7]

Answer:

T_{f} = 335.780\,K\,(62.630\,^{\textdegree}C)

Explanation:

Let assume that air behaves ideally. The equation of state of ideal gases is:

P\cdot V = n\cdot R_{u}\cdot T

Where:

P - Pressure, in kPa.

V - Volume, in m³.

n - Quantity of moles, in kmol.

R_{u} - Ideal gas constant, in \frac{kPa\cdot m^{3}}{kmol\cdot K}.

T - Temperature, in K.

Since there is no changes in pressure or the quantity of moles, the following relationship between initial and final volumes and temperatures is built:

\frac{V_{o}}{T_{o}} = \frac{V_{f}}{T_{f}}

The final temperature is:

T_{f} = \frac{V_{f}}{V_{o}}\cdot T_{o}

T_{f} = 1.13\cdot (297.15\,K)

T_{f} = 335.780\,K\,(62.630\,^{\textdegree}C)

7 0
3 years ago
Read 2 more answers
NEED HELP!!!!!!!!!!!!!
raketka [301]

it would be 'B' because it speeds up reactions

7 0
3 years ago
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