How many grams of CoCl2 in 1/2 liter would be used to make a 1.0 molar solution? (can you show steps please?)

Answer:

292.4 g

Explanation:

First we convert 53.7 g of Al into moles, using its molar mass:

Then we convert Al moles into H₂SO₄ moles, using the stoichiometric coefficients:

Finally we convert 2.98 moles of sulfuric acid into grams, using its molar mass:

Answer:

13 branches/tree

Explanation:

Step 1: Given data

Step 2: Calculate the total number of branches (b)

We will use the following expression.

b = l × b/l

b = 19565 leaves × 1 branch/35 leaves = 559 branch

Step 3: Calculate the number of branches per tree (b/t)

We will divide the total number of branches by the total number of trees.

559 branches/43 trees = 13 branches/tree

Answer: The mass of aluminium sample is 55.4 gram

Explanation:

[tex]Q_{absorbed}=Q_{released}[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

[tex]m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)][/tex]      

where,

[tex]m_1[/tex] = mass of aluminium = ?

[tex]m_2[/tex] = mass of water = 300.0 g

[tex]T_{final}[/tex] = final temperature = [tex]23.8^0C[/tex]

[tex]T_1[/tex] = temperature of aluminium = [tex]94.5^oC[/tex]

[tex]T_2[/tex] = temperature of water = [tex]21.0^oC[/tex]

[tex]c_1[/tex] = specific heat of aluminium = [tex]0.897J/g^0C[/tex]

[tex]c_2[/tex] = specific heat of water =  [tex]4.184J/g^0C[/tex]

Now put all the given values in equation (1), we get

[tex]-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)][/tex]

[tex]-[m_1\times 0.897\times (23.8-94.5)^0C]=[300.0g\times 4.184\times (23.8-21.0)][/tex]

[tex]m_1=55.4g[/tex]

Therefore, the mass of aluminium sample is 55.4 gram

The correct answer is option A; Mesosphere

The mesosphere is defined as the part atmosphere found above the stratosphere but below the thermosphere.

In this layer of the atmosphere, temperature decreases with height. It covers about 50 to 85 km above the earth.

Mesosphere is the only layer of the atmosphere that was correctly spelt among the options.

Learn more: https://brainly.com/question/12117482

Answer:

6.80×10¯²⁶ J

Explanation:

From the question given above, the following data were obtained:

Frequency (f) = 102.5 MHz

Energy (E) =?

Next, we shall convert 102.5 MHz to Hz. This can be obtained as follow:

1 MHz = 10⁶ Hz

Therefore,

102.5 MHz = 102.5 MHz × 10⁶ Hz / 1 MHz

102.5 MHz = 1.025×10⁸ Hz

Finally, we shall determine the energy. This can be obtained as follow:

Frequency (f) = 1.025×10⁸ Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =?

E = hf

E = 1.025×10⁸ × 6.63×10¯³⁴

E = 6.80×10¯²⁶ J

Answer:

pH value of HCL = 2.69897

Explanation:

Given:

Concentration of HCL = 0.002 M

Find:

pH value of HCL

Computation:

pH value of HCL = - log(Concentration of HCL)

pH value of HCL = - log(0.002)

pH value of HCL = 2.69897

Answer and Explanation:

Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose.

Answer❣

The required speech is as follows :

_______________

"Whoever controls media, controls mind". A very hearty Good Morning to one and all present here ! Respected Principal Sir, worthy teachers and all my dear fellow mates. Today I Aurora, of class XYZ is standing before you in this frizzy winter to deliver a short speech on the topic 'How media influences public opinion'.

Dear friends, first of all I would like to ask you all a question, 'What do you think is our media for ?' Most of us will reply that they are for our entertainment, fun and even unfortunately some will reply 'for movies and Bollywood'. Now if we look back at our history during 18th century we see that even first newspapers were started for spreading information in mass. Earlier literacy rate of India was very low.

A single person used to first read the newspaper and then shared the information to the gathered people around. But that time was different. Now nearly every person has a mobile phone, TV, PC and what not. Has this increased public participation in Democracy ? Yes indeed it has done that. On one single click we get information of our surrounding at a faster pace. As a fourth pillar of Democracy it makes our mindful of different social, political and financial exercises around us.

If we take current situation, most of the election popularisation works in different states is being managed by mass media only due to its advancements. Media makes participation of people in political activities even at grass - root levels. This efficiency enhances the Federalism of India. Media has many roles in shaping public opinion in our society. Let's discuss them one by one. In economic terms, media shows the expenditure, budgets and taxes to the citizens of a nation.

It makes people aware of the different types of money related issues that they have to face. Even it checks that no people are harassed by fake news on balances. Its makes people rise over their concern directly to the government so that actions can be taken for them. In social terms, media promotes the functioning of the government. It helps people to convey their social problems to the government. Even many NGOs and Human Rights Organizations take help of medias to make people aware of their rights.

Commonly Media acts as an inference or better to say 'compass' which gives direction to the views of people. It organises the vast multitudes of opinions into a single issue which can be beneficial to all the groups of society. It works 24 × 7 and makes people get in touch with latest developments. As 'Opposition' in Politics, media acts as a hub where the opposition party by taking views of public claims the wrong decisions of Ruling Party.

Also, during elections media shows mirror about different parties to people so that we can make right decision in voting. All these were some positive aspects of media's influence on public opinions. Now let's discuss about some negative aspects also. Nowadays its a common seen trend that media enlarges a short issue just to gain popularity. This results in riots, violence, protests, etc. because the issue which could have been solved by a single subtle discussion, now has been made a larger issue.

Let me present an example. I have a friend, Cupicake. She remains quite much familiar with medias. Some days ago, she received a post which asked her to share the image attached with it to her other friends. That image was of a case where Police was beating a few groups of people. She has shared that. This led a immediate violence in that region and finally it was known that Police was beating a few robbers. Now who to put blame of that riot ? Of course we are the one who done it.

At last I would like to conclude my speech by just saying that, it is the duty of media to transfer right and reliable information to people and its duty of people to share and trust upon right information from a good source. In this way the world and the nation would be leaded to right path.

Thank you one and all.

_______________

★ More to know :-

Format of Speech :

*Note - Here I used name as Aurora. You can use any according to your choice and class also according to the situation.

✌✌✌✌✌✌✌✌✌✌✌✌

hope that u r helpful

please follow thank and brinlylist please

Thank You...♡♡

Answer: 126.1 grams of are needed to make 5.3 L of 0.25 M solution

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

To calculate the mass of solute for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{given mass of solute}}{\text {Molar mass of solute}\times \text{Volume of solution in L}}[/tex]

[tex]0.25M=\frac{x}{95.2g/mol\times 5.3L}[/tex]

[tex]x=126.1g[/tex]

Thus 126.1 grams of are needed to make 5.3 L of 0.25 M solution

Answer:

c. core, mantle and atmosphere

Answer:

Correct answer is letter A

Because Lithosphere includes the crust and the uppermost mantle.

Answer:

Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)

Explanation:

CaS (aq) + CdCl₂ (aq) –> CdS (s) + CaCl₂ (aq)

The complete ionic equation for the above reaction can be obtained as illustrated below:

In solution:

CaS (aq) —> Ca²⁺(aq) + S²⁺(aq)

CdCl₂ (aq) —> Cd²⁺(aq) + 2Cl¯(aq)

CaS (aq) + CdCl₂ (aq) –>

Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)

Answer:

hello can you follow me

Explanation:

used in fire extinction, blasting rubber, foaming rubber and plastic

Answer:

See explanation

Explanation:

According to the question Copper is obtained from  the original alloy and the copper wire used to displace the silver.  

So,

Mass of the copper from the original alloy: (10.00 % * 1.250 g) =  0.125 g

We now need to obtain the mass of the copper from the wire, then we consider how much silver is precipitated:

Mass of silver in the alloy; 90.00 % * 1.250 g = 1.125 g

So,

Amount of silver precipitated =

1.125 / 107.9 = 0.01043 mole

From the reaction equation, it takes two moles of silver to displace one mole of copper.

Hence, the amount of copper from the wire is:  0.01043 / 2 = 0.005213 mol

And a mass of  0.005213(63.55) = 0.3313 g

Total mass of copper=  0.125 + 0.3313 = 0.456 g

Answer:

10.5M HCl

Explanation:

Using the chemical reaction:

KOH + HCl → H₂O + KCl

Where 1 mol of KOH reacts per mole of HCl

We can solve this problem converting the mass of KOH to moles using its molar mass. The moles of KOH added are equal to moles of HCl in the solution. That is:

Moles KOH = Moles HCl

154.9g KOH * (1mol / 56.1g) = 2.761 moles

The molarity of the solution (Moles HCl per liter of solution) is:

2.761moles HCl / 0.262L =

Answer:

6.3moles

Explanation:

The balanced chemical equation for the decomposition of phosphorus oxychloride (POCl3) is as follows:

POCl3 → POCl + Cl2

Based on the above decomposition reaction, it shows that;

1 mol of POCl3 will decompose to give 1 mole of Cl2

Hence, 6.3 moles of POCI3 will give 6.3 moles of Cl2.

Answer:

11 electrons

Explanation:

The number of electrons is the same as the number of protona in a ATOM.

They will most likely be different in a ion, simple bond or a convalent bond.

Answer:

The most abundant chemical/gas is Nitrogen, which makes up about 78% and Oxygen at second place with approximately 21%

Answer:

Nitrogen and Oxygen because about 70% of air is nitrogen and around 20% of air is Oxygen.

Hope this helps!

Answer: The hydrogen ion concentration in molarity is 0.013

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pOH is calculated by taking negative logarithm of hydroxide ion concentration and pH is calculated by taking negative logarithm of hydrogen ion concentration

Putting in the values:

[tex]pOH=-\log[7.609\times 10^{-13}][/tex]

[tex]pOH=12.1[/tex]

Now , [tex]pH+pOH=14[/tex]

[tex]pH=14-12.1=1.9[/tex]

[tex]pH=-\log [H^+][/tex]

[tex][H^+]=0.013M[/tex]

The hydrogen ion concentration in molarity is 0.013

Answer:

HCl(aq) + KOH(aq --> KCl(aq) + H₂O(l)

Explanation:

Explanation:

hece ,, it is your answer you can see

The new volume with raised temperature can be find out using Charles's law. When the temperature of the gas is raised to 20 to 30 degree celsius, the volume will increase from 3 L to 4.5 L.

Charles law states that at constant pressure, the volume and temperature of a gas are in direct proportion.

Hence V/T = a constant.

Let V1 and T1 bet the initial volume and temperature and V2 and T2 be the final volume and temperature respectively. Then we can write it as:

[tex]\rm \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

It is given that the initial volume and temperature of the gas are 3 L at 20 degree Celsius. The final temperature is 30 degree celsius then the final volume can be calculated as :

V2 = V1 T2/ T1

     = (3 L × 20 °C) / 30 °C

     = 4.5 L.

Hence, the final volume of the gas is 4.5 L.

To find more on Charles law, refer here:

https://brainly.com/question/16927784

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Answer:

b) carboxylic acid

Explanation:

Answer:

6.19 mol H₂O

Explanation:

First, we convert 70.25 grams of NH₃ into moles, using its molar mass:

Then we convert 4.13 moles of NH₃ into moles of H₂O, using the stoichiometric coefficients of the balanced reaction:

the answer is A..which is true

A first order reaction has a rate constant of 0.00318 min^-1. The half-life of this reaction is therefore 94.7 min

Answer:

114.23g

Explanation:

Mass = xg

Mole = 0.334 mol

Molar mass of Sucrose

(C = 12, H = 1, O = 16)

C12H22O11

(12×12)+(1×22)+(16×11)

144 + 22 + 176

342g/mol

Mass = No of mole × Molar mass

Mass = 0.334 × 342

Mass = 114.228

Mass ≈ 114.23g

Answer:we see 1 side because the other side is not visible

Explanation: