What is the pOH of a solution with a [OH-] of 10-11

Ethanol (CH3CH2OH) has been suggested as an alternative fuel source. Ethanol’s enthalpy of combustion is Hcomb = –1368 kJ/mol. W

madam [21]

Answer:

a) V = 1.41 gal

Explanation:

Ethanol:

∴ Hcomb = - 1368 KJ/mol.........( - ) exothermic reaction

∴ δ = 0.789 g/mL

∴ Mw Ethanol = 46.07 g/mol

⇒ Eδ = (1368 KJ/mol)(mol/46.07 g)(0.789 g/mL) = 23.4285 KJ/mL

isooctane:

∴ Eδ = 32.9 KJ/mL

∴ δ = 0.703 g/mL

1 gal = 3785 mL

⇒ E = (32.9 KJ/mL)(3785 mL) = 124526.5 KJ

Volume of Ethanol:

⇒ (Eδ)(V) = 124526.5 KJ

⇒ V = (124526.5 KJ)/(23.4285 KJ/mL) = 5315.167 mL

⇒ V = (5315.167 mL)( gal/3785 mL) = 1.404 gal ≅ 1.41 gal

8 0

3 years ago

Which description correctly characterizes the acidity or basicity of a solution? The higher the pH is, the more the hydroxide io

azamat

Answer:

The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

Explanation:

When the pH of a solution is less than 7, then solution is called acidic and as the pH decreases the concentration of Hydronium ion increases.
When the pH is about 7, then the solution is said to be neutral. On the other hand, when the pH is greater than 7, the solution is is said to be basic and as the pH increases the concentration of Hydroxide ions increases.
Therefore, An acidic solution has a higher concentration of hydrogen ions compared to the concentration of hydroxide ions.

3 0

4 years ago

What are the rules for calculating protons

Mashcka [7]

Answer:

Find the element,

Explanation:

Finding the element will tell you how many protons there are. For example, if you are given an atom of oxygen, you can figure out the number of protons by looking it up on a periodic table, which gives you 8.

If an atom is neutral, find the number of electrons. This number will also be the number of protons.

3 0

3 years ago

(b)

Luda [366]

The maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g

<h3>Stoichiometry </h3>

From the question, we are to determine the maximum mass of anhydrous zinc chloride that could be obtained

From the given balanced chemical equation,

ZnO + 2HCl → ZnCl₂ + H₂O

This means 1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂ and 1 mole of H₂O

From the given information

Number of moles of ZnO = 0.0830 mole

Now, we will calculate the number of moles of HCl that is present

Volume of HCl added = 100 cm³ = 0.1 dm³

Concentration of the HCl = 1.20 mol/dm³

Using the formula,

Number of moles = Concentration × Volume

Number of moles of HCl present = 1.20 × 0.1 = 0.120 mole

Since

1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂

Then,

0.06 mole of ZnO will react with the 0.120 mole of HCl to produce 0.06 mole of ZnCl₂

Therefore, maximum number of moles of anhydrous zinc chloride that could be produced is 0.06 mole

Now, for the maximum mass that could be produced

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of ZnCl₂ = 136.286 g/mol

Then,

Mass = 0.06 × 136.286

Mass = 8.17716 g

Mass ≅ 8.18 g

Hence, the maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g

Learn more on Stoichiometry here: brainly.com/question/11910892

3 0

2 years ago

How much did shell erosion increase between 1995 and 2020?

saveliy_v [14]

The mussel shell erosion increased by 30 percent points between 1995 and 2020.

<h3>What is erosion?</h3>

Erosion is the washing away of the top layer of a substance or material.

The mussel shell erosion is a type of erosion which occurs in mussel shell as a results of chemical changes that occur on their environment.

The mussel shell erosion is shown on the graph.

Therefore, based on the graph, mussel shell erosion increased by 30 percent points between 1995 and 2020.

Learn more about erosion at: brainly.com/question/12759847

#SPJ1

5 0

2 years ago