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yKpoI14uk [10]
3 years ago
11

A student dissolves 73 g of sodium nitrate, NaNO3, in 100 mL of water and observes a clear, colorless

Chemistry
1 answer:
ohaa [14]3 years ago
4 0
I 90% sure that it would be supersaturated
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How are the carbon, nitrogen, and oxygen cycles different?
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The organ system that allows for movement of the organism as a whole an for internal movement of food through the digestive syst
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A freezer compartment is covered with a 2-mm-thick layer of frost at the time it malfunctions. If the compartment is in ambient
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Answer:

The time required to melt the frost is 3.25 hours.

Explanation:

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q=h_c*A*\Delta T\\\\q/A=h_c*\Delta T

being hc the convective heat transfer coefficient (2 Wm^-2K^-1) and ΔT the difference of temperature (20-0=20 °C or K).

q/A=h_c*\Delta T=2\frac{W}{m^2K}*20K=40\frac{W}{m^2}

If we take 1 m^2 of ice, with 2 mm of thickness, we have this volume

V=T*A = 0.002 m * 1 m^2=0.002m^3

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M=\rho * V=700\frac{kg}{m^3}*0.002m^3= 1.4 kg

Then,  the amount of heat needed to melt this surface (1 m²) of frost is

Q=L*M=334\frac{kJ}{kg}*1.4kg= 467.6kJ

The time needed to melt the frost can be calculated as

t=\frac{Q}{(q/A)}=\frac{467.6kJ/m2}{40W/m2} = 11.69\frac{kJ}{W}*\frac{1W*s}{1J}*\frac{1000J}{1kJ}=   11690s=3.25h

7 0
3 years ago
Which diagram shows how the particles of the solid substance will look after it has absorbed enough heat to melt partially ??
cricket20 [7]
It would be A, the molecules should be closely packed together but arranged randomly. :)
4 0
3 years ago
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