on 2
6 pts
Calculate the molarity of NaCl (MM= 58.44) solution that contains 14.61 g in 200,0 mL
using the correct number of significant figures,
O 0.05000 M
O 0.7305 M
O 4.269 M
O 1.250 M

Answer:

8.31 KPa.L/Kmol

Explanation:

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

Pressure = 101.3 KPa

Temperature (T) = 0 °C = 273 K

Number of mole (n) = 1 mole

Volume = 22.4 L

Gas constant (R) =?

The gas constant can be obtained as follow:

PV = nRT

101.3 × 22.4 = 1 × R × 273

2269.12 = R × 273

Divide both side by 273

R = 2269.12 / 273

R = 8.31 KPa.L/Kmol

Therefore, the value of the gas constant is 8.31 KPa.L/Kmol

Answer:

by repeating the experiment

Explanation:

sometimes repeating the experiment with multiple trials can help make the experiment worth it

Answer:

amount of gas and pressure

Explanation:

1kg x 0,37=370gHCL

370g/36,5g/mol=10,137mol/kg

1l=1,185kg

10,137 x 1,185kg/l =12,0mol/l

(x/ml(12mol HCL)*12mol/L)/100ml=0,025mol/L

x=

Answer:

it's the last one.

Explanation:

a compound reaction that occurs when one element within a compound is exchanged with another element.

The similarity between nuclear energy and fossil fuel is "as both fuels undergo reactions, heat is released, which is used to do work."

Nuclear energy is the type of power produced when a nuclear reaction releases energy. Nuclear energy was exemplified mostly by the electricity generated by just a nuclear reactor, which is Japan's principal source of energy.

Fossil fuel is just a hydrocarbon-containing component that occurs naturally in the earth's crust and is collected and being used as a fuel. The most popular fossil fuels are coal, crude oil, and natural gas.

Therefore, similarity between nuclear energy and fossil fuel is both fuels undergo reactions, heat is released, which is used to do work.

To know more about nuclear energy and fossil fuels

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Answer:

Each water molecule can form two hydrogen bonds involving their hydrogen atoms plus two further hydrogen bonds utilizing the hydrogen atoms attached to neighboring water molecules.

Explanation:

From the equation, [tex]\frac{p1 * v1}{t1} = \frac{p2 * v2}{t2}[/tex], we make v2 the subject of the formula, so that gives us: [tex]\frac{p1 * v1 * t2}{p2 * t1}[/tex]

Standard temperature = 273k

Standard pressure = 1atm

Plugging in our values, [tex]\frac{1.8 * 4.5 * 273}{1 * 140} = \frac{2211.3}{140} = 15.795 litres[/tex]

Answer:

A stock or standard solution is a solution in which you accurately know its concentration. You can make stock solutions in the chemistry laboratory or buy from chemical manufacturers. Once you have a stock solution, you can prepare solutions of lower concentration by diluting the concentrated stock solution.

Explanation:

To make the correct volume of stock solution, we should add first solid to a volumetric flask.

Stock solution is a standard solution in which exact concentration of solute is present in particular volume. It is mainly used in analytical chemistry during the titration process.

During the preparation of stock solution, we should first add solid in the volumetric flask and then little amount of water to dissolve the solid and then finally add water to the required volume. If we first add total volume and then add solid then dissolution of solid may increase volume.

Hence, first we add solid in the volumetric flask.

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Answer:

The answer is D, "sweat requires a lot of thermal energy to be absorbed to evaporate."

Explanation:

Like the other person, I just took the test.

An impact of the specific heat of water on the planet and the life forms in it is: D. sweat requires a lot of thermal energy to be absorbed to evaporate.

Thermal energy is also referred to as heat and it can be defined as a form of energy that is transferred from one physical object to another, especially due to a difference in temperature.

Generally, a lot of thermal energy is required to be absorbed for sweat to evaporate and this is mainly due to the impact of specific heat of water on the planet and all the life forms that are existing on it.

Read more on thermal energy here: brainly.com/question/12072129

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

[tex]0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal[/tex]

So, there are 0.0305 calories in 0.128 joules

Answer:

∆H= 3.92 kJ

∆S= 2.54 J

Explanation:

Hope It helps

Answer:

I believe the answer is C.

Answer:

C

Explanation:

green house gases effects increases global warming

Answer:

Al2(SO3)3 + 6NaOH → 3Na2SO3 + 2Al(OH)3

Answer:

1)more

2) increase

3)less

4)decrease

Explanation:

Oxidation can be regarded as process involving loss of electrons when a reaction is taking place by an atom or molecule, atom as well as ion. Oxidation do take place as when there is increase in oxidation state of a molecule as well as atom or ion. Reduction which is opposite process takes place as a result of gain in electrons, or when there is decrease in oxidation state of an atom as well as molecule, or ion. Oxidation number gives the the number which is been allocated to elements during a reaction of chemical combination. It gives the count of sharable electrons for an atoms or electron it can gain or loose as chemical bonding is taken place.

It should be noted Oxidation, or the loss of electrons, will result in an element becoming more positive. This element will show an increase in oxidation number. Reduction, the gain of electrons, will cause an element to become less positive and the element will show a decrease in oxidation number.

Answer:

Number 3 alkyne is the answer

Explanation:

Answer: The answer is Alkyne.

Answer:

Explanation:

Here, a balance between attraction between nucleus and electrons, and electron-electron, and nuclei-nuclei repulsion play role.

All chemical bonds are formed by overlapping of orbitals. If the electronegativity of the two elements forming the bond is very different (elements from the 1st ,2nd groups with elements of 7th group) then ionic bond are formed. If the electronegativities are more similar, then overlapping is stronger, and covalent bonds are formed.

Answer: Ultraviolet rays are the wave which has high enough energy to cause damage to skin and sometimes cancer.

Explanation:

Ultraviolet rays also known as UV rays have a range of wavelength from 400 nm to 10 nm.

As energy is inversely proportional to wavelength. Hence, shorter is the wavelength of a UV-ray higher will be its energy.

Also, UV rays have high enough energy due to which they are able to penetrate through the living cells causing damage to the skin. If a person remains under UV rays for a longer period of time then it can cause sunburn and could also cause skin cancer.

Thus, we can conclude that ultraviolet rays are the wave which has high enough energy to cause damage to skin and sometimes cancer.

Answer:

The independent variable is the temperature to which the paint and materials are exposed

The dependent variable is the presence of peeling and cracking of the paint

The constant rates are the paint and material used for each trial

Explanation:

The treatment the to which the paint is subjected = Temperatures from 260 °C  to 650 °C

The method of determining the paint quality = By peeling and cracking

The types of paint and materials used = The same paint and material

The independent variable is the variable suspected as the cause of the effect being studied. It is the variable introduced as a treatment

In the question, given that the paint is subjected to different temperatures from between 260°C to 650 °C, the temperature changes introduced is the independent variable

Therefore;

The independent variable = The temperature to which the paint and materials are exposed to

The dependent variable is the effect variable. It is the variable of the property being investigated and it is also the variable that is measured in the investigation

In the question, given that the after heating the paint and material, the scientist check for peeling and cracking, the dependent variable is the occurrence of cracking and peeling at a given temperature

Therefore;

The dependent variable = The presence of peeling and cracking of the paint

The constant rate(s) are variables which are kept constant during the investigation, under the different treatments

The constant rate(s) in the tests are the paint and material, which were kept the same for each trial to reduce the effect of underlying factors that may impact on the result and obscure the relationship between the dependent and independent variables

Therefore;

The constant rate are the paint and material used for each trial

Answer:

The correct answer is - B. New Moon.

Explanation:

The change of moon disc from all black to all light to all dark again is called the lunar cycle. It takes almost 30 days (29.53059 to be precise). The time from all black to all light or all light to all black is almost 15 days. All black moon is termed as the new moon and all light is termed as the full moon.

As given that the full moon is shown happening on the eleventh of the month then what moon would be around 25 which is 14 days later that should be in waxing gibbous phase and almost new moon.

Thus, the correct answer is - B. new moon.

Answer:

Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.

Explanation:

Answer:

the iupac name of CH3-CH2-CH2-OH Propanol.

Answer:

diluted

Explanation:

dilution is when you have a solution and you add a liquid to it to make it less strong

Answer:

true

Explanation:

Answer:

b

Explanation:

he throws the ball into the air