What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?

2.9 × 10–5 M H3O+ and 3.4 × 10–10 M OH–
3.1 × 10–6 M H3O+ and 3.2 × 10–9 M OH–
5.0 × 10–9 M H3O+ and 2.0 × 10–6 M OH–
6.3 × 10–11 M H3O+ and 1.6 × 10–4 M OH–

Explanation:

Correct option is

B

18

As reaction for the formation of Al 2

is as follows:

4Al+3O

2

→Al 2

O

this shows that 4 mol reacts to 3 mol ( 96 g) of O

2

so as 3 mol O

2

to 4 mol Al

then 0.5 mol O 2 to 3, 4

×0.5=0.66 mol of Al

as 1 mol Al = 27 g

then 0.66 mol of Al=0.66×27=17.9 g≈18 g

Hence, the correct option is B.

Answer:

pH = 13.1

Explanation:

Hello there!

In this case, according to the given information, we can set up the following equation:

[tex]HCl+KOH\rightarrow KCl+H_2O[/tex]

Thus, since there is 1:1 mole ratio of HCl to KOH, we can find the reacting moles as follows:

[tex]n_{HCl}=0.012L*0.16mol/L=0.00192mol\\\\n_{KOH}=0.032L*0.24mol/L=0.00768mol[/tex]

Thus, since there are less moles of HCl, we calculate the remaining moles of KOH as follows:

[tex]n_{KOH}=0.00768mol-0.00192mol=0.00576mol[/tex]

And the resulting concentration of KOH and OH ions as this is a strong base:

[tex][KOH]=[OH^-]=\frac{0.00576mol}{0.012L+0.032L}=0.131M[/tex]

And the resulting pH is:

[tex]pH=14+log(0.131)\\\\pH=13.1[/tex]

Regards!

Answer:  Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz.

HOPE THIS HELPS

Answer:

89.3 mL

Explanation:

First we convert 20.0 °C and 54.0 °C to K:

With the absolute temperatures we can solve this problem by using Charles' law:

Where in this case:

We input the data:

And solve for V₂:

Answer:

NaOH

Explanation:

An unknown solution has a pH of 6.8. The chemical that will increase the pH is NaOH. The correct option is a.

Acids have lower pH, and they are sour and bases have high pH, and they are bitter in taste.

HCl, NH3, HNO3 are all acids and acid decrease the pH. Only NaOH is a base, and it will increase the pH.

Thus, the correct option is a. NaOH.

Learn more about acid and bases

https://brainly.com/question/23687757

#SPJ2

Answer:

0.078

Explanation:

The equation is :

                [tex]$2SO_3 (g) \ \ \ \Leftrightarrow \ \ \ 2 SO_2(g) \ \ \ + \ \ \ O_2(g)$[/tex]

Initial         0.948                  -----                   ----

Change      -2x                     +2x                  +x

Final          0.369                  2x                    x

So the total pressure must reman same = 0.948

And the total pressure = partial pressure of all gases

0.948   =   ( 0.369 + 2x + x )

0.948  =  0.369 + 3x

[tex]$x=\frac{0.579}{3}$[/tex]

  = 0.193 atm

So the partial pressure of [tex]$SO_2$[/tex]  = 0.193 x 2

                                                   = 0.386 atm

Partial pressure of [tex]$O_2$[/tex]  =  0.193 atm

Therefore,

[tex]$k_p=\frac{(P_{SO_2})^2(P_{O_2})^}{(P_{SO_3})^2}$[/tex]

    [tex]$=\frac{(0.386)^2(0.193)}{0.369}$[/tex]

    = 0.078

Answer:

39.2 g

Explanation:

2Ni₂O₃(s) ⟶ 4Ni(s) + 3O₂(g)

First we convert 55.3 g of Ni₂O₃ into moles, using its molar mass:

55.3 g ÷ 165.39 g/mol = 0.334 mol Ni₂O₃

Then we convert 0.334 Ni₂O₃ moles into Ni moles, using the stoichiometric coefficients of the balanced reaction:

0.334 mol Ni₂O₃ * [tex]\frac{4molNi}{2molNi_2O_3}[/tex] = 0.668 mol Ni

Finally we convert 0.668 Ni moles into grams, using its molar mass:

0.668 mol * 58.69 g/mol = 39.2 g

Answer:

Aspartic acid may be considered hydrophobic at physiological.

Answer:

Yung explain

Explanation:

Shu makou du mang sugumani hinam dilomaoan

The figure shows particles of a substance in a closed container. The state of matter shown in the figure is a gas.

For more questions on state of matter

https://brainly.com/question/9402776

#SPJ8

Answer: Volume is 0.594 litres

Explanation: Amount of moles = volume · concentration

n = Vc  and V = n/c = 0.642 mol / 1.08 mol/l = 0,59344..  l

Answer:

A) It's correctly written

B) 77%

C) 835 calories

Explanation:

A) From online sources, we have number of calories as follows;

Fats: 9 calories per gram

Protein; 4 calories per gram

Carbs; 4 calories per gram

Total calories for each;

Total fat = 3 × 9 = 27 calories

Total protein = 3 × 4 = 12 calories

Total carbs = 32 × 4 = 128 calories

(sugar and dietary Fibre are classified as carbohydrates and so total carbs takes care of their calories).

Thus, total number of calories per serving = 27 + 12 + 128 = 167 calories per serving which is same as what is given.

B) percent from carbohydrates per serving = total calories from carbs/total number of calories per serving × 100% = 128/167 × 100% ≈ 77%

C) One box contains 5 servings. Thus total number of calories per box = 167 × 5 = 835 calories

Answer:

Lithium Bromide: LiBr and Potassium chloride: KCl.

Explanation:

A substance that will conduct electricity when dissolved completely in water is known as an Electrolyte.

Now, electrolytes are usually salts that ionize completely in a solution unlike non - electrolytes that do not dissociate into ions in solution.

Looking at the options, the only ones that are Salts are Lithium Bromide: LiBr and Potassium chloride: KCl.

Thus, options

Lithium Bromide: LiBr and Potassium Chloride: KCI will conduct electricity

when dissolved in water.

Electrolytes are referred to as compounds which conduct electricity when

dissolved in water. A salt is a common example of a compound which

dissolves in water to  generate electricity which makes it an electrolyte.

In the options the salts present are Lithium Bromide and Potassium

Chloride which is why options B and D are the most appropriate choice.

Read more about Salts here https://brainly.com/question/13818836

Answer:

2Fe + 3H2SO4 → Fe2(SO4)3 + 3H2

Explanation:

Iron is a metallic element with chemical symbol, Fe while concentrated sulphuric acid is a chemical compound with chemical formula, H2SO4. Both are involved in a chemical reaction as follows:

Fe + H2SO4 → Fe2(SO4)3 + H2

However, this reaction is not balanced as the number of moles of each atom in both the reactants and product side is not equal. To balance the equation, we have to ensure that each number of atom is equal. The balanced equation are as follows:

2Fe + 3H2SO4 → Fe2(SO4)3 + 3H2

aluminium has bigger atomic size than chlorine

because atomic radii decreases across the period and increases down the group

this law would hold owing to the fact that chlorine and aluminum are on the same period

Answer:

In summer, anticyclones bring dry, hot weather. In winter, clear skies may bring cold nights and frost. In cold conditions, anticyclones may also bring fog and mist. This is because the cold forces moisture in the air to condense at low altitudes.

Answer:

an anticyclone is an area of high pressure that brings fine setteled weather. in an anticyclone the air is decending which means it is trapped on the ground and cannot rise, therefore we don't get rain!

Explanation:

Answer:

C₂H₄O

Explanation:

Empirical formulas show the simplest ratio of atoms in a compound in whole numbers.

We can think that all the atoms are divisible by 4.

As we need the lowest number for each subscript, empirical formula is:

C₂H₄O

We have divided, 8/4 for carbon, 16/4 for H and 4/4 for O.

The empirical formula is also known as the simplest expression to represent a chemical

Answer:

I believe so. If I get this wrong I'm sorry.

Explanation:

Answer:

Q = 360 Joules

Explanation:

specific heat of copper = 0.400 J/g° C

mass of copper = 30 g

initial temperature = 20.0°C

final temperature = 50.0°C

Using the formula:

Q = mcΔT

where;

Q = Heat Energy

[tex]Q = m*c * (T_2-T_1)[/tex]

Q = (30 × 0.400)(50-20)

Q = 360 Joules

Answer:

Hello, Im Mack. Hope you're doing well. :)

Here is my Correct, custom answer for the lab Question, (I also took the same assignment and got a 100% score)

Explanation:

The heating of the sodium acetate solution made it change from super-saturated to un-saturated. Yet now that it cooled back to room temperature Im sure it is saturated. it wasn't able to disolve the excess sodium acetate left over at room temperature and had to be heated so now that it is back to room temperature I Think it will not disolve the sodium acetate left in the solution until it is heated again.    

Hope this helped you out,

Please feel free to comment for further help, and I'll reply asap.

Have a great day my friend :)

Answer:

Equation of Reaction

2AgNO3 + BaCl2 === 2AgCl + Ba(NO3)2

Molar Mass of AgNO3 = 170g/mol

Moles of reacting AgNO3 = 100g/170gmol-¹

=0.588moles of AgNO3

From the equation of reaction...2moles of AgNO3 reacts to Produce 2Moles of Silver Chloride

So Their ratio is 2:2.

This means that 0.588Moles of AgCl Will be produced too.

ANSWER...0.588MOLES OF AgCl WILL BE PRODUCED.

Answer:

Equation: C3H8 + 5O2 = 3CO2 + 4H2O (already balanced)

a) If you start with 14.8 g of C3H8 and 3.44 g of O2, determine the limiting reagant

b) Determine the number of moles of carbon dioxide produced

c) Determine the number of grams of H2O produced

d) Determine the number of grams of excess reagant left

Answer:

C₄H₃N

Explanation:

To solve this question we must find the moles of each atom in order to find the empirical formula (Simplest ratio of atoms present in a molecule). With empirical formula and the molar mass of the compound we can find the molecular formula as follows:

Moles H:

91.5mg H * (1mmol / 1mg) =

91.5mmol H

Moles N:

424mg N * (1mmol / 14mg) =

30.286mmol N

The ratio of moles regard to moles N (The lower number of moles is:

H = 91.5mmolH / 30.286mmolN = 3.0

N = 30.286mmolN / 30.286mmolN = 1

empirical formula = CₓH₃N

The molar mass of this formula is:

12*x + 1*3 + 1*14 = 17g/mol

Solving for X:

12X + 17g/mol = 65g/mol

12X = 48g/mol

X = 4

There are 4 atoms of carbon and molecular formula is:

Answer:

[tex]\boxed {\boxed {\sf 0.3 \ mol \ NaNO_3}}[/tex]

Explanation:

Molarity is a measure of concentration in moles per liter.

[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]

The molarity of the solution is 1.2 M NaNO₃ or 1.2 moles NaNO₃ per liter. There are 0.25 liters of the solution. The moles of solute are unknown, so we can use x.

[tex]1.2 \ mol \ NaNO_3/L= \frac{x}{0.25 \ L}[/tex]

We are solving for x, so we must isolate the variable, x. It is being divided by 0.25 liters. The inverse of division is multiplication, so we multiply both sides by 0.25 L.

[tex]0.25 \ L *1.2 \ mol \ NaNO_3/L=\frac{x}{0.25 \ L} *0.25 \ L[/tex]

[tex]0.25 \ L *1.2 \ mol \ NaNO_3/L=x[/tex]

The units of liters cancel, so we are left with the units moles of sodium nitrate.

[tex]0.25 *1.2 \ mol \ NaNO_3=x[/tex]

[tex]0.3 \ mol \ NaNO_3=x[/tex]

There are 0.3 moles of sodium nitrate.

Answer:

The answers are in the explanation.

Explanation:

1. Commutative property: The order of the numbers does not affect the result:

6 + 5 = 5 + 6

2. Associative property: In add or multiply, you can operate regardless of how the numbers are grouped.

(9×2)×4=9×(2×4)

3. Associative property:

(1 x 4) x 0 = 1 x (4x 0 )

4. Commutative property:

17 + 19 = 19 + 17

5. Associative property:

(13+6)+7=13+(6+7)

Option A is correct.

This is because atoms get compressed when the pressure increases and takes less space, on the other hand, the atoms get expanded when pressure decreases and hence take more space.

Answer:

3.12 x 25.6 = 79.9 g