HELP ME!!ILL GIVE U BRAINLIESTT!!!!!

Answer:

The 2nd one

Explanation: U answered yourself on the second one

Answer: I don't have the last column though.

Explanation:

Answer:

1. pOH = 1.01 and the pH = 12.99.

2. a) %I = 0.417 %, b) pH =  2.34.  

Explanation:

1. The pH of the dissolution of Ba(OH)₂ in water can be calculated using the following equation:

[tex]pH = 14 - pOH = 14 - (-log[OH^{-}]) = 14 + log[OH^{-}][/tex]

To find the pOH, first, we need to calculate the concentration (C) of Ba(OH)₂:

[tex] C_{Ba(OH)_{2}} = \frac{\eta}{V} = \frac{m}{M*V} [/tex]

Where:

η: is the number of moles of Ba(OH)₂

V: is the volume of the solution = 100 ml = 0.100 L

M: is the molar mass of Ba(OH)₂ = 171.34 g/mol

m: is the mass of Ba(OH)₂ = 0.837 g          

[tex] C_{Ba(OH)_{2}} = \frac{m}{M*V} = \frac{0.837 g}{171.34 g/mol*0.100 L} = 0.049 mol/L [/tex]  

Knowing that in 1 mol of Ba(OH)₂ we have two moles of OH⁻, the concentration of OH⁻ is:

[tex] C_{OH^{-}} = \frac{2*\eta_{Ba(OH)_{2}}}{V} = 2*C_{Ba(OH)_{2}} = 2*0.049 mol/L = 0.098 mol/L [/tex]

Now, we can find the pOH and the pH of the solution:

[tex] pOH = -log[OH^{-}] = -log(0.098) = 1.01 [/tex]

[tex] pH = 14 - pOH = 14 - 1.01 = 12.99 [/tex]

2. a) The percentage of ionization (% I) of acetic acid can be calculated using the following equation:

[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100[/tex]

We need to find the [H⁺] = [H₃O⁺] at the equilibrium:

CH₃COOH(aq) + H₂O(l) → CH₃COO⁻(aq) + H₃O⁺(aq)  

 1.0 - x                                        x                   x

[tex] Ka = \frac{[CH_{3}COO^{-}]*[H_{3}O^{+}]}{[CH_{3}COOH]} [/tex]

Ka: is the dissociation constant of acetic acid = 1.75x10⁻⁵

[tex] 1.75\cdot 10^{-5} = \frac{x^{2}}{1.0 - x} [/tex]

[tex] 1.75\cdot 10^{-5}(1.0 - x) - x^{2} = 0 [/tex]     (1)  

By solving equation (1) for x we have two solutions:

x₁ = -0.00417

x₂ = 0.00417 = [H₃O⁺] = [CH₃COO⁻]  

We will take the positive value to find the percentage ionization:          

[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100 = \frac{0.00417 M}{1.0 M}*100 = 0.417 \%[/tex]    

b) The pH of the solution is:

[tex] pH = -log([H_{3}O^{+}]) = -log(0.00417) = 2.34 [/tex]

I hope it helps you!          

Answer:u got me stumped

Explanation:

Simulating Earth's gravity in space would be challenging, but it is possible to create artificial gravity using centrifugal force. Centrifugal force is the outward force experienced by an object that is moving in a circle.

An unobservable force that draws things together. Anyone remains on the ground thanks to Earth's gravity, which also causes objects to fall.

One way to create artificial gravity in space is by building a rotating space station. The station would consist of two main parts: a central hub and a rotating section.

The hub would contain the crew quarters, life support systems, and other essential components, while the rotating section would be attached to the hub via a set of cables or other structures.

The rotating section would be set spinning, creating centrifugal force that would push the crew towards the outer rim of the section. This force would create a sensation of gravity that would be similar to that experienced on Earth.

Thus, by rotating a spacecraft, it is possible to create a centrifugal force that mimics the gravitational force of Earth.

To learn more about the gravity, follow the link:

https://brainly.com/question/31321801

#SPJ2

Answer:

The molar volume of a gas is the volume of one mole of a gas at STP. At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).

Explanation:

Answer:

Explanation:

B

Answer:

approximately 15.1 grams.

Explanation:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Hope it helps :)

Answer:

9.79g of O2

Explanation:

So this question you are trying to go from g of KCLO3 to grams of oxygen. There is no direct conversion so you have to utilize multiple process.

[tex]25.0g KCLO3 * \frac{1mol KCLO3}{122.55 gKCLO3} * \frac{3mol O2}{2 mol KCLO3} * \frac{32.00g O2}{1mol O2}[/tex]

=9.79 g of O2

So first you go from g of KCLO3 to moles of KCLO3  by using molar mass of KCLO3. Then you use mol:mol ratio from balanced equation to go to moles of O2, and finally use molar mass of O2 to go to grams of O2.

Answer:

One mole of SnO2

Explanation:

SnO2(s) + 2H2(g) ------> Sn(s) + 2H2O(l)

In every question that has to do with stoichiometry, the balanced reaction equation is the first step towards obtaining the correct answer because it serves as a guide in solving the question.

From the balanced reaction equation, we have

1 mole of SnO2 reacts with 2 moles of hydrogen gas to yield two moles of water.

The balanced reaction equation represents one mole of SnO2.

Hence the answer.

Answer:

Toxicity is how much something can harm you, like poison. A quick example of this is rat poison. You can put it in traps to kill rats, but if you ingest it it'll also kill you. Also, tide pods are perhaps a more relevant example.

Answer:

The answer to the question is orbit

When it is tilted away from the Sun, it is winter in the northern hemisphere. In between we have autumn and spring. The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. This is the longest day (most daylight hours) of the year for people living in the northern hemisphere.

Democrats and Republicans

Answer:

Polar Bears

Arctic Foxes

Seals

Penguins

They all live in the cold, so they all must live in the Arctic Tundra ;)

Answer:

Animals such as polar bears, arctic wolves, and arctic foxes live in the Arctic Tundra.

Answer: Nuclear Fission

Answer:

Beta Decay

Explanation:

Answer: Removing Products, Adding Products, Changes in Volume and Pressure, and Changes in Temperature

Answer:refer to the image below

Answer:

It does this by using a thermal conductor (usually metal) to carry heat away from the processor into fins that expose a high amount of surface area to moving air. This allows the air to be heated, thus cooling the heat sink and the processor as well.

Answer:

increase

Explanation:

Please see the step by step explaination in the pictured attached below.

26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 901 mm Hg = 1.18 atm   (760 mm Hg = 1 atm)

V = Volume of gas = 5.00 L

n = number of moles = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]0^0C=(0+273)K=273K[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{1.18atm\times 5.00L}{0.0821L atm/K mol\times 273K}=0.263moles[/tex]

The chemical reaction for the decomposition of calcium carbonate follows the equation:

[tex]CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)[/tex]

According to stoichiometry:

1 mole of carbon dioxide is produced by = 1 mole of calcium carbonate

Thus 0.263 moles of carbon dioxide is produced by = [tex]\frac{1}{1}\times 0.263=0.263[/tex] moles of calcium carbonate

Mass of calcium carbonate=[tex]moles\times {\text {Molar mass}}=0.263mol\times 100g/mol=26.3g[/tex]

26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]

Answer:

They will try to defend themselves

Explanation:

Answer:

octopuses will shoot a dark liquid, sometimes called ink, at the thing that scared them. ... If an octopus does get caught — no problem. They can lose arms and regrow them.

Explanation:

Answer:

13,200 mL

Explanation:

multiply by 1000 to go from L to mL

Answer: 105 u

Explanation:

Answer:smoke

Explanation:smoke is a gas

Answer:

That is exactly what happens when esters are hydrolysed by water or by dilute acids such as dilute hydrochloric acid. The alkaline hydrolysis of esters actually involves reaction with hydroxide ions, but the overall result is so similar that it is lumped together with the other two.

Explanation:

Answer:

Complete ionic equation

Explanation:

For every reaction, we could write the molecular equation as well as the ionic equation. The net ionic equation only shows the reaction of the main ions that take part in the reaction. It does not show the reaction of spectator ions.

In order to write the complete ionic equation for any reaction, we must observe the following steps;

We have to start by writing a balanced molecular equation for that particular reaction. Secondly, we split up the soluble strong electrolytes solutions into their constituent ions. It is necessary to indicate the correct formula and charge for each ion participating in the reaction. The individual stoichiometric coefficients of each ion is used toindicate the correct number of all the participating ions. All compounds formed during the reaction are noted with the appropriate symbols (s) for solid, (l) for liquid, or (g) for gaseous respectively.

Answer:

period 3 and group 3

Explanation:

I'm saying group 3 because that is how I learnt it at school, but if you count it then it's in group 13.

Answer:

1.00 mol

71.0g P4 0 10          1mol p4 0 10              4 moles H3 PO4

____________  x  ___________    x     ______________

      1                     283.886g P4 0 10           1mol P4 0 10

= 1.00 moles H3 PO4

1.00 moles of H₃PO₄ are produced

Given:

Mass of P₄O₁₀ = 71.0 g

To find:

Moles of H₃PO₄ = ?

Balanced chemical reaction:

P₄O₁₀(s) + H₂O(l) → H₃PO₄(aq)

Molar mass of P₄O₁₀ = 283.866 g or 284 g

Number of moles is defined as given mass over molar mass.

[tex]\text{Moles of } H_3PO_4= \frac{71.0 g P_4O_{10}}{1} \times \frac{1 mol P_4O_{10}}{283.886 g P_4O_{10}} \times \frac{4 moles H_3PO_4}{1 mol P_4O_{10}} \\\\\text{Moles of } H_3PO_4= 1.00 mol[/tex]

Find more information about Number of moles here:

brainly.com/question/13314627

Answer:

5000 nL

Explanation:

Answer: 5000 nL

Explanation: