if you prepare 25mL of 0.010M NaCl starting with a 0.500 M NaCl solution, how much of the initial solution do you need?

An example of The substance which is composed of aromatic hydrocarbins is :  Pain reliever.

Aromatic hydrocarbons are hydrocarbons in nature are composed of 6 rings of carbn atoms ( fused benzene rings ) certain compounds like petroluem contain aromatic hydrocarbons in nature. Certain medical drugs administered are composed of aromatic hydrocarbins an example of such drugs are pain relievers.

Hence we can conclude that the substance which is composed of aromatic hydrocarbons is pain reiever.

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The reactions involved are synthesis, combustion and single replacement reactions and the masses of products formed are dependent on the mole ratio.

Limiting reactants are reactants are reactants that are used in a chemical reaction.

The equation for the production of water is given below:

[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]

The reaction is a synthesis reaction and the mole ratio of hydrogen to oxygen is 2 : 1.

Moles of 250 g of Hydrogen = 250/2 = 125 moles

Moles of water produced = 125 moles

Mass of water = 125 × 18 = 2250 g

Moles of oxygen in 250 g = 250/32 = 7.81 moles

Moles of water produced = 7.81 × 2 = 15.62

Mass of water produced = 15.62 × 18 = 281.16 g

Since moles of oxygen use is less than the mole ratio of reaction, oxygen is the limiting reactant.

2. The reaction of propane and oxygen is a combustion reaction and is given below:

[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]

1 mole of propane produces 4 moles of water

44 g of propane produces 72 g of water

Mass of propane required to produce 1000 g of water = 1000 × 44/ 72 = 611.1 g of propane

3. The reaction of zinc and hydrochloride acid is a single replacement reaction and the equation is given below:

[tex]Zn + 2HCl \rightarrow ZnCl_2 + H_2[/tex]

1 mole of Zn and 2 moles of HCl are required to produce 1 mole of hydrogen gas

Molar mass of Zn = 65 g

Molar mass of HCl = 36.5

Molar mass of hydrogen = 2.0 g

150 g of Hydrogen gas = 150/2 = 75 moles of hydrogen

Mass of 75 moles of Zn = 75 × 65 = 4875 g

mass of 75 × 2 moles if HCl = 150 × 36.5 =5475 g

Therefore, 4875 g of Zn and 5475 g of HCl are required to produce 150 g of Hydrogen gas.

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Answer: 0.05 A

Explanation:

Hope this helps!

A video-disc player that is not playing still uses 6.0 W of power. The current is  0.05 A.

What is Power?

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings.  A scalar quantity is power.

Power is related to other factors; for instance, the power required to move a ground vehicle is equal to the product of the vehicle's velocity, traction force on its wheels, and aerodynamic drag.

A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft. Similar to how the power expended in an electrical component of a circuit is the result of the current.

Therefore, A video-disc player that is not playing still uses 6.0 W of power. The current is  0.05 A.

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Answer:

There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding

Explanation:

hope i help!.

Answer:D) Gold, Au

Explanation:

Metals are conductive because of their free electrons. Gold is highly conductive.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number. Therefore the correct option is option D

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable. Since metals have free electrons that's why they can conduct electricity

A. Radon, Rn is an radioactive element so it is not metal so it can not conduct electricity

B. Nitrogen, N is an non metals hence it can not conduct electricity

C. Bromine, Br is also non metals so it can not conduct electricity

D. Gold, Au is a metals hence it can conduct electricity

Thus conducting electricity well is the properties of Gold is used in the household wiring. Therefore the correct option is option D

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Answer:

2 x 10^5 liters

Explanation:

P1V1 = P2 V2

P1V1 / P2  = V2  =  .05 *4 x 10^6  / 1  = .2 x 10^6  liters

Answer:

I believe it would be the last 2

Explanation:

the 4th one is magnesium and something else but that's with decomposition and so is the last one. the first three has water and oxygen and stuff that doesn't rly do decomposition

The equilibrium constant gives us an idea of the extent of reaction. For the reaction; 2GeCl4(g) = 2Ge(g) + 4Cl2 (g), the equilibrium constant is 1 * 10^-20.

The equilibrium constant gives us an idea of the extent of the conversion of reactants to products in a reaction.

In this case, we know that 2GeCl4(g) = 2Ge(g) + 4Cl2 (g) is the reverse of Ge (g) + 2Cl2 (g) <-> GeCl4 (g) hence we only need to invert the value of the equilibrium constant and raise it to power 2 to have 1 * 10^-20.

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pH:-

It's acidic as pH<7

Now

Answer:

If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.

Explanation:

hope this helps

pls mark brainliest

Answer:

more/less depending on if it lost or gained electrons during the ionic bond process

Answer: 2.62 moles

Explanation:

For every 2 moles of ammonia that are produced, 1 mole of nitrogen is consumed.

This means that if 5.24 moles of ammonia are produced, 5.24/2=2.62 moles of nitrogen are consumed.

Answer:

Aluminum

Explanation:

I just used the Reactivity Series chart :)

Answer: 1.43 atm

Explanation:

For  the molarity and the  percentage of the mass of kcl are mathematically given as

%m/m = 23.1%, molarity  = 3.38M

Generally, the equation for the  percentage of the mass of kcl is mathematically given as

(mass of kcl/mass of solution)x 100

therefore

%m/m = (6.31/27.29)x100

%m/m = 23.1%

The molarity

(no of mol/ vol of sol)

molarity  = 0.0846mol/0.0250 L

molarity  = 3.38M

In conclusion, the molarity is given as

molarity  = 3.38M

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Answer:

No It is not

Two of the same atoms are most likely not identical

Answer: The empirical formula is C₃H₃O.

Explanation: Assume we have 100 g of the compound. Then we have 65.65.5 g of C, 5.5 g of H, and 29.0 g of O.

Answer:

C₃H₃O

Explanation:

I took the test

The molality of the toluene is 1.46 mol/kg.

The molality of a solution is its molal concentration. Molal concentration is denoted by m. It is the mol of solute dissolves in 1 Kg solvent.

The depression at freezing point is directly proportional to the molality of the solution. The equation we use for this type of problem is:

ΔT=iKm [tex]f_m[/tex]

Where,  ΔT [tex]f_m[/tex] is depression at freezing point, i is Van't hoff factor, m is molality and [tex]K_f[/tex] is the freezing point depression constant.

Toluene is a non-electrolyte and so the value of i for this is 1.

Depression at a freezing point is given as -13.[tex]0^0[/tex] and the [tex]K_f[/tex] is given as 5.12. So, we could calculate the molality of the solution using the equation written above.

Let's plug in the values in the equation:

ΔT=iKm[tex]f_m[/tex]

-7.51 =1 x5. 12 xm

m = [tex]\frac{7.51}{5. 12}[/tex]

m = 1.46 m

It means the molality of the solution is 1.46 mol/kg.

Hence, the molality of the solution is 1.46 mol/kg.

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The heat lost by copper(ii) sulfate is equal to heat absorbed by water since the total energy in the system remains constant according to the law of conservation of energy.

The number of moles of a substance is determined using the formula below:

Assuming the mass of copper(ii) sulfate used is Mc, number of moles of copper(ii) sulfate used is:

The heat absorbed by water is calculated using the formula below:

mass of water = 10 g

Let temperature change be Tc

Heat absorbed by water = 10 × 4.186 × Tc = 41

86Tc

The change in internal energy, ΔU of copper(ii) sulfate, is given as:

where:

Q =  heat absorbed by water

W  =  work done by or on the system

The enthalpy of the reaction is given as:

Therefore, according to the law of conservation of energy, the total energy in the system remains constant.

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Answer:

The answer is B a larva

Explanation:

Answer:

B. Larva

Explanation:

it is when a catipliar hatches

Answer:

how many moles of Al are produced from a reaction using 82 g of Ca?

Explanation:

How many moles of Fe2O3 will react with 99.0 g of Al? 1.83. 2. Ammonium nitrate decomposes to yield nitrogen gas, water, and oxygen gas in the following ...

Answer:

Third choice

Explanation:

From the graph.....more heat is required to change from  Liquid to a gas than is required to change from a solid to a liquid  ( see how the flat line portion is longer?)

Answer:

It depends on its mass and its chemical composition. Give me Brainiliest

Answer:

Fastest C. Reaction time is faster

Slowest A. Reaction time is slower and it takes longer to finish

Explanation:

An electrophoretic separation of lactate dehydrogenase isoenzyme that demonstrates elevation in LD-1 greater than LD-2 could be indicative of Hemolysis.

Hemolysis is a process (generally natural process) associated with the elimination of red blood cells.

Hemolysis can be defined as the removal of erythrocytes due to internal or external environmental factors.

Hemolysis can be discovered by analyzing (or counting) the number of certain proteins in plasma.

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Answer: C

Explanation:

Increasing the temperature increases the rate of dissolving.

Answer:

it can be in the production of nitric acid

Answer:

Explanation:

Nitrogen oxides are used in the production of nitric acid, lacquers, dyes, and other chemicals. Nitrogen oxides are also used in rocket fuels, nitration of organic chemicals, and the manufacture of explosives.

What is the difference between natural and artificial radioactivity?

Natural radioactivity comes from elements in nature. Artificial radioactivity comes from elements created in nuclear reactors and accelerators.

Answer:

natural is made from grass and artificial is made from toxic gas

Explanation:

yes

Answer

Dmitri Mendeleev Explanation:The modern periodic tables is credited primarily to the russian chemist Dmitri Mendeleev. Mendeleev's table is based on the periodic law, which states that when elements are arranged in order of increasing mass, their properties recur periodically.