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.

<span>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. </span>

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Consider the reaction when aqueous solutions of potassium hydroxide and ammonium nitrate are combined. The net ionic equation fo

Reil [10]

Answer: $OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)$

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

$KOH(aq)+NH_4NO_3(aq)\rightarrow KNO_3(aq)+NH_3(g)+H_2O(l)$

The equation can be written in terms of ions as:

$K^+(aq)+OH^-(aq)+NH_4^+(aq)+NO_3^-(aq)\rightarrow K^+(aq)+NO_3^-(aq)+NH_3(g)+H_2O(l)$

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The ions which are present on both the sides of the equation are potassium and nitrate ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is :

$OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)$

6 0

2 years ago

The coolant in automobiles is often a 50/50 % by volume mixture of ethylene glycol, C2H6O2, and water. At 20°C, the density of e

Misha Larkins [42]

Explanation:

Let the volume of the solution be 100 ml.

As the volume of glycol = 50 = volume of water

Hence, the number of moles of glycol = $\frac{mass}{molar mass}$