which one is right i need help

Answer:

0.60 mol·L⁻¹  

Explanation:

Data:  

LiBr: c = 0.50 mol/L; V =300 mL

RbBr: c = 0.70 mol/L; V =300 mL

1. Calculate the moles of Br⁻ in each solution

(a) LiBr

\(\text{Moles} = \text{0.300 L} \times \dfrac{\text{0.50 mol}}{\text{1 L}} = \text{ 0.150 mol}\)

(b) RbBr

\(\text{Moles} = \text{0.300 L} \times \dfrac{\text{0.70 mol}}{\text{1 L}} = \text{ 0.210 mol}\)

2. Calculate the molar concentration of Br⁻

(a) Moles of Br⁻

n = 0.150 mol  + 0.210 mol = 0.360 mol

(b) Volume of solution

V = 300 mL + 300 mL = 600 mL = 0.600 L

(c) Molar concentration

\(c = \dfrac{\text{moles}}{\text{litres}} = \dfrac{\text{0.360 mol}}{\text{0.600 L}} = \textbf{0.60 mol/L}\)

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

The addition of LiBr and RbBr has been dissociated into the equal moles of Li, Rb, and Br.

\(\rm LiBr\;\rightarrow\;Li^+\;+\;Br^-\)

\(\rm RbBr\;\rightarrow\;Rb^+\;+\;Br^-\)

Thus 1 mole of LiBr = 1 mole Br

1 mole RbBr = 1 mole Br.

The moles of LiBr in 0.5 M solution:

Molarity = \(\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}\)

0.5 = \(\rm moles\;\times\;\dfrac{1000}{300\;ml}\)

Moles of LiBr = 0.15 mol

The moles of Br from LiBr = 0.15 mol.

The moles of RbBr in 0.7 M solution:

Molarity = \(\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}\)

0.7 = \(\rm moles\;\times\;\dfrac{1000}{300\;ml}\)

Moles of RbBr = 0.21 mol

The moles of Br from RbBr = 0.21 mol.

The total moles of Br ions from LiBr and RbBr has been :

= 0.15 + 0.21

= 0.36 mol.

The total volume of the solution will be:

= 300 + 300 ml

= 600 ml.

The concentration of the Br ion has been:

Molarity = \(\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}\)

Molarity of Br ions =  \(\rm 0.36\;\times\;\dfrac{1000}{600\;ml}\)

Molarity of Br ions = 0.6 M.

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

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Weight=Force applied

\(\\ \bullet\sf\leadsto Force=ma\)

\(\\ \bullet\sf\leadsto Force=65(9.8)\)

\(\\ \bullet\sf\leadsto Force=637N\)

\(\\ \bullet\sf\leadsto Force=65(25)\)

\(\\ \bullet\sf\leadsto Force=1625N\)

Answer:

i cannot do this sorry and plz help me

Answer:

Part 1: Sodium and Rubidium.

Part 2:

Protons = 12

reason: protons are equal to the atomic number of an atom. For Magnesium, atomic number is 12.

Neutrons:

\( = { \tt{24 - 12 }} \\ = { \tt{12 \: neutrons}}\)

reason: neutrons is given by formula:

\({ \tt{neutrons = mass \: number - atomic \: number}}\)

where mass number of magnesium is 24.

electrons: = 12 electrons

reason: Magnesium atom has electrons summing up to 12

part 1: hydrogen and sodium? my memory is so bad ngl

part 2: 36 because there are 12 protons, 12 electrons, and 12 neutrons in an atom of magnesium.

Answer:

"There is no God but Allah, and Muhammad is his messenger." This is the basic statement of the Islamic faith: anyone who cannot recite this wholeheartedly is not a Muslim. When a Muslim recites this they proclaim: That Allah is the only God, and that Muhammad is his prophet.

I hope u find the right path

Explanation:

Answer:

option c the relative number of atoms of each element using the lowest ratio because empirical formula gives the simplest-whole number ration of each element

e.g. the empirical formula of benzeneC6H6 in CH

Explanation:

I HOPE IT WILL HELP YOU

Answer:

Global Tempurature is rising

Sea level is rising

Explanation:

This is evidence of climate change. Depending on where you live it could be different like in florida there was a drought.

Answer:An exothermic reaction may be defined as a type of reaction in which energy is significantly liberated in the form of heat or light. In such types of reactions, energy is generally transferred into the surroundings rather than utilized from the surroundings.

The option "energy from an outside source is continuously being added" represents an endothermic reaction in which heat or light energy is externally been provided. The option "more heat is given off than is put into the reaction" is not absolutely true because exothermic reactions liberate energy but it does not matter if it is higher or lower than that of being put into the reaction.

Therefore, the reactants have more heat energy than the products is a statement that is true about exothermic reactions. Thus, the correct option for this question is C.

Explanation:

you welcome

Energy from outside sources is continuously being added, since its an exothermic reaction it always focusses on releasing large amount of energy upon activation and combustion.

It cuts off on giving energy back to its surrounding unlike endothermic reaction where the generated energy is given back to the environment to restore its energy levels.

Therefore, it makes it clear that exothermic reaction is a type of reaction that uses combustion to gather the energy lying around in the surrounding to generate large amount of energy and heat and keeps on producing heat until and unless there is energy in surrounding.



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Answer: The answer to your question is B,C,D.

Answer: i think A, B, D?

Explanation:

Answer:

is c before space I did it

Explanation:

Answer:

It will have more speed/more acceleration than or the ground.

Explanation:

It will lean twords the side that moves and for ex if the wagon has a level to pull a gap down the ball will go forward

Answer:

Alot of salt dissolved in warm water than in cold water

Explanation:

This is because cold water does  not dissolve alot of salt and hot water dissolves alot of salt because of the kinetic energy acting on the liquid

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

Answer:

I do experiment with salicylic acid

Explanation:

I I think you have to run and write the equation that you made in salicylic acid because salicylic acid is very harmful to us human have skin that is made up of Cleveland Clinic

Answer:

B mixtures

Explanation:

Answer: continental crust is created and oceanic crust is destroyed.

Explanation:

Answer:

Radioactivity.

Answer:

A) 8.51 × 10²⁴  

Explanation:

1. Gather all the information

            2H₂S + SO₂ ⟶ 3S + 2H₂O

n/mol:   9.42

2. Calculate the moles of S atoms

The molar ratio is 3 mol S:2 mol H₂S

\(\text{Moles of S} = \text{9.42 mol H$_{2}$S} \times \dfrac{\text{3 mol S }}{\text{2 mol H$_{2}$S }} = \text{14.13 mol S}\)

3. Calculate the atoms of S

\(\text{Atoms of S } = \text{14.13 mol S} \times \dfrac{6.022 \times 10^{23}\text{ S atoms}}{\text{1 mol S}} = \mathbf{8.51 \times 10^{24}}\textbf{ S atoms}\)

The sulfur atoms that should be generated is \(A) 8.51 \times 10^24\).

Given that,

\(= \frac{3\times 6.022\times 10^23\times 0.42}{2}\\\\= 85.0909 \times 10^23\\\\= 8.509 \times 10^24\\\\= 8.51 \times 10^24\)

Therefore we can conclude that the sulfur atoms that should be generated is \(A) 8.51 \times 10^24\).

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Answer:

Some energy was lost in the process of the blades moving.

Explanation:

Hope this helps!

The amount of mechanical energy produced less than the amount of electrical energy used, because some amount of energy is loss as sound energy and to start the movement of blades.

When one form energy is converted into another form then this process is known as transformation of energy, for example conversion of electrical energy into mechanical energy.

When we turn on blender in the kitchen it consumes the electrical energy and try to move its blades to produce mechanical energy and in addition to this it also produces sound energy because of the movement of blades. So, some amount of energy is loss initially to rotate the blades that's why we get little less amount of mechanical energy.

Hence, for the movement of blades some amount of energy will loss.

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Answer:

We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars and moving freight, and manufacturing the products we rely on in our daily lives are all functions that require energy.

Explanation:

Hope this helps :\

A renewable resource is a substance of economic value which can be replenished or replaced either through natural recurring processes or biological reproduction.

This happens due to the renewable energy. Now let us understand the renewable energy are those energy that can be used again and again and it re-new after a short period of time. it is generally defined as that kind of energy resources that can be renewed naturally.

Renewable sources of energy can replace conventional sources of energy which produce harmful gasses which is harmful as well as costly.

We divide this energy in few sectors like: residential, commercial, transportation, and industrial. People use these resources for many different things which are used daily.

One of the major resource is the UV rays and people use it to produce the electricity. Many of such resources are also used in different chores like cooking, driving vehicles, etc.

Example: biomass is a biological material taken from plants or plant-based materials.

Biomass is considered a renewable resource because plants and plant-based materials can be found everywhere and once used these plants will continue to grow and supply the demand for biomass consumption.

Therefore, these resources are the most useful resources which can be renewed easily and thus used in different ways.

To know more about the renewable resources, refer: https://brainly.com/question/27570414

#SPJ4

Answer:

Chemical properties

Explanation: