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2 years ago

What is the room temperature of water?

1 answer:

4 0

I surmise that the person who asked this question was wondering why water in a room may sometimes be colder than ambient air and by how much.

For water to get cooler than ambient air requires two conditions: exposed water surface or water able to seep through a clay pot, and relatively low ambient humidity level (usually lower than 30% relative humidity). These two conditions combined enable evaporation. Now, evaporation of liquid water into water vapor necessitates input of latent energy (2257 kJ/kg), and this is at the expense of the remaining liquid water. Thus, liquid water in a room can be at a temperature lower than room temperature.

By how much? There is no straight answer to this because the temperature of the remaining liquid water depends on (1) the rate of evaporation, which itself depends on the amount of surface exposure and the room humidity and temperature, (2) the amount of water remaining in the pot, and (3) the rate of reheating of the water by the ambient air. In practice, the water temperature can be lower than room temperature by several degrees Celsius.

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Coal containing 15.0% H2O, 2.0% S and 83.0% C by mass is burnt with the stoichiometric amount of air in a furnace. What is the m

devlian [24]

Answer:

This is a coal combustion process and we will assume

Inlet coal amount = 100kg

It means that there are

15kg of H2O, 2kg of Sulphur and 83kg of Carbon

Now to find the mole fraction of SO2(g) in the exhaust?

Molar mass of S = 32kg/kmol

Initial moles n of S = 2/32 = 0.0625kmols

Reaction: S + O₂ = SO₂

That is 1 mole of S reacts with 1 mole of O₂ to give 1 mole of SO₂

Then, it means for 0.0625 kmoles of S, we will have 0.0625 kmole of SO2 coming out of the exhaust

The mole fraction of SO2(g) in the exhaust=0.0625kmols

Explanation:

5 0

2 years ago

The reaction 2 ClO2(g) + F2(g) → 2 FClO2(g) is first-order in both ClO2 and F2. When the initial concentrations of ClO2 and F2 a

kupik [55]

Answer:

3. 75.0%

Explanation:

2 ClO2(g) + F2(g) → 2 FClO2(g)

First order with respect to ClO2 and F2.

This means the rate equation is given as;

Rate = k [ClO2][F2]

When the initial concentrations of ClO2 and F2 are equal?

Let's assume an initial value of 1 for both reactants, so rate equation is given as;

Rate = k * 1 * 1 = k

The rate after 25% of the F2 has reacted is what percent of the initial rate?

The concentration left of F2 is 75% ( 100% - 25%) = 0.75

Concentration of ClO2 remains 1.

So rate equation is given as;

Rate = k * 1 * 0.75 = 0.75 k

Comparing 0.75k and k.

This means our answer is;

3. 75.0%

6 0

3 years ago

For an atom of chlorine-35, what number would you put as the SUPERSCRIPT in the atomic notation?

kobusy [5.1K]

<h2>Answer:</h2><h3>CI.Strictly speaking,the subscript is unnecessary ,since all atoms of cholorine have 17 protons.Hence the isotope symbols are usually written withouth the subscript.³⁵CI and ³⁷CI</h3>

<h2>EXPLANATION:</h2><h2>I HPE IT HELP THANK YOU!</h2>

6 0

2 years ago

The octet rule states that all atoms would like to have 8 electrons in their last shell with no exceptions! true or false

Montano1993 [528]

True due to the fact that eight electrons are what applies directly to the octet rule

7 0

3 years ago

Why is carbon stable

Evgesh-ka [11]

Carbon is very special because it can form so many compounds. ... Carbon atoms can form strong links with four other atoms. This dramatically increases the number of patterns that carbon atoms can make. Carbon can also link together in long chains or rings, carbon to carbon to carbon to carbon and so on.

3 0

2 years ago