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Valentin [98]
3 years ago
12

2.

Chemistry
1 answer:
schepotkina [342]3 years ago
3 0

Answer:

b. 6.02 x 1023 molecules

Explanation:

The formula mass of ammonia is 14 + 1 × 3 = 17.

The number of moles in 27.6g ammonia is 27.6 ÷ 17 = 1.62 mol.

A mole is 6.02 × 10²³, so the number of hydrogen atoms in a 1.62 moles of ammonia is 1.62 × 6.02 × 10²³ × 3 = 2.93 × 10² atoms.

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The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel
Lilit [14]

Answer:

The sign of \Delta GΔG is negative.

The sign of \Delta HΔH is negative.

The sign of \Delta SΔS is negative.

Explanation:

The water vapor is adsorbed on silica gel due to strong hydrophilicity of silica get towards the water.

The thermodynamic properties of adsorbate and adsorbent changes after adsorption. Silica gel is very porous and hydrophilic, thus, it absorbs the water from the shoe box.

The adsorption process occurs spontaneously, therefore Delta G < 0.

When adsorption occurs, bonds are formed between water molecules and SiO2, and the bond formation process is exothermic (heat is released).

Thus, Delta H < 0.

The water molecules become immobilized on the surface when adsorption occurs, thus, entropy/disorder decreases.

So, Delta S < 0.

8 0
3 years ago
What is the mass, in kg, of a 2.12-g piece of lead
Lunna [17]

Answer:

0.00212 kgs

Explanation:

one gram is equal to 0.001 kilograms

5 0
3 years ago
For each of the following solutions, calculate [OH- ] from [H3O + ] or [H3O + ] from [OH- ]. Classify each solution as acidic, b
Yuri [45]

The case is acidic since calculated pH is below 7 that is 2.3

The hydroxide and hydrogen ion levels in a solution are the sources for calculating pOH and pH levels, respectively, and are the basis of whether a solution is acidic or basic

[H₃O+]=5.3×10⁻³M

To determine the hydroxide ion concentration, we use:

[OH−][H3O+]=1×10⁻¹⁴

We isolate the hydroxide ion concentration:

[OH−]=1×10−145.3×10⁻³M

Solving this, we obtain:

[OH−]=1.9×10−¹²M

We can determine whether the solution is acidic or basic by calculating the pH level:

pH=−log[H3O+]

We substitute in the hydronium ion concentration given:

pH=−Log(5.3×10−3)pH=2.3

Since the pH is below 7, the solution is acidic

Learn more about hydroxide ion here-

brainly.com/question/25883474

#SPJ4

4 0
2 years ago
When you can not see what is taking place, but other senses indicate occurences. this is called?
Alona [7]

It is called an indirect instance of watching, noticing, or making a statement. you might also be thinking of quiet and sneaky instance of watching, noticing, or making a statement but that is when you sense something that is below the point where something begins or changes of the senses.

 

6 0
3 years ago
Which technology would be the most useful in predicting an eruption from an undersea volcano and why
sveticcg [70]

Answer: Infrasound because sound waves travel easily through water to accessible buoys.

Explanation: its installation: underwater microphones hung from buoys near a volcano. how it works: senses low-frequency sound waves near a volcano. Since in its installation it specifies that it has UNDERWATER microphones and the question asks in predicting an eruption from an UNDERSEA volcano, that makes perfect sense.

8 0
3 years ago
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