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3 years ago

The default solution is water, describe the solution. What is the pH?

Chemistry

2 answers:

Nonamiya [84]3 years ago

8 0

The pH of pure water is 7.

Oksana_A [137]3 years ago

3 0

PH pure water.
Because that’s they only one that’s makes more sense

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Given:

strojnjashka [21]

Answer:

≈ 708

Explanation

Here we have equation as:

4 Al + 3 O₂ → 2 Al₂O₃

As we know:

No of moles = Mass/ Molar mass

Here, Mass is 375 g and Molar mass is 27 gms, so no. of moles of Al will be:

=375 g /27 g/mol

= 13.889 mol

About mole ratio, we can see that for 4 moles of Al , 2 moles of Al2O3 are formed, so for 13.889 moles of Al, 13.889 mol ÷ 2 =6.944 moles of Al₂O₃ will be formed.

As we know:

Mass= No of moles/Molar mass

Mass of Al₂O₃ = 6.944 mol × 102 g/mol

= 708.288 g

Hope it helps!

3 0

4 years ago

Which description is true of earth’s four layers?

Levart [38]

Answer:

The astenosphere is located below the lithosphere

The mantle is composed of silicate material

Explanation:

The Earth has several different layers, and they can be presented in two different manners, depending on their chemical composition and their physical properties. According to the chemical composition the Earth has three layers, crust, mantle, and core, while in accordance to the physical properties it has five, lithosphere, astenosphere, mesosphere, outer core, and inner core.

The astenosphere is the second layer from the top, and it lies just below the lithosphere. It is also the upper part of the mantle. The mantle is a layer that is largely composed of silicate material, mostly silicate molten rock. It can easily be seen from the volcanic activities that this layer is composed of silicate material because the magma is rich in it, and the magma comes from this layer.

6 0

3 years ago

Compound X has a molar mass of 283.89 mol^-1 and the following composition:

olchik [2.2K]

Explanation:

the above process is done in very detail .

hope this is helpful.

7 0

3 years ago

hich statement is true? A. An acid with a large pKa will be a better conductor of electricity than one with a smaller pKa. B. An

xz_007 [3.2K]

Answer:

$\boxed{\text{B is correct}}$

Explanation:

Kₐ and pKₐ are measures of the strength of an acid. For example,

HX + H₂O ⇌ H₃O⁺ + X⁻; Kₐ = 10¹⁰, pKₐ = -10

HA + H₂O ⇌ H₃O⁺ + A⁻; Kₐ = 10⁻¹⁰, pKₐ = 10

HX is a strong acid, because it has a larger Kₐ, that is, the position of equilibrium lies far to the right.

However, pKₐ is the negative logarithm of Kₐ, so HX has the smaller pKₐ.

Similarly, Ha is a weak acid, but it has the larger pKₐ.

Strong acid: Large Kₐ ⇔ Low pKₐ

Weak acid: Small Kₐ ⇔ High pKₐ

A is wrong. HA is a weak acid, so it produces only a few hydronium ions.

B is correct. The rate of corrosion depends on the concentration of hydronium ions. HA is a weak acid, so it is less corrosive than an acid with a small pKₐ.

C is wrong. HX is a strong acid, so there are more ions to carry the current. HX will be a good conductor of electricity.

D is wrong. HX is a strong acid, so it provides more hydronium ions and is more corrosive.

E is wrong. HX is a strong acid, so it provides more hydronium ions to stimulate the taste buds.

$\boxed{\textbf{B is correct}}$

7 0

4 years ago

How are a fact and a theory similar

Serhud [2]

Answer: A butterfly population includes both green and yellow butterflies, and a predator sees yellow more easily than it does green" would lead to evolution since the green ones would live on.

Explanation:

7 0

3 years ago