What is the molality of a solution made by dissolving 3.71 g of sodium chloride in 0.535 L of water?

Answer:

Explanation:

mass of the hydrogen atom in C3H8= 4.58 gram

C3H8                         8H

25.2 gram                  x

(3x12)+ 8                   8x1

    x =  4.58 grams of H

# moles of hydrogen = mass/m.wt

                                 = 4.58/8= 0.57 mole of hydrogen atom

Answer:

The final temperature of the water-steel system is 16.853 ºC.

Explanation:

We consider the system of water sample and the piece of steel as control mass, which is supposed to be an isolated system, that is, a system with no mass and energy transfer with surroundings. As water has more mass and a higher specific heat that piece of steel, it is very unlikely that evaporation and condensation would affect the outcome.

The piece of steel is cooled down while water is heated up, until thermal equilibium is reached. By First Law of Thermodynamics, we must observe that:

[tex]Q_{water}-Q_{steel} = 0[/tex]

[tex]Q_{water} = Q_{steel}[/tex]

Where:

[tex]Q_{water}[/tex] - Heat received by the water sample, measured in joules.

[tex]Q_{steel}[/tex] - Heat released by the piece of steel, measured in joules.

Now, we expand each term by definition of sensible heat:

[tex]m_{w}\cdot c_{w}\cdot (T-T_{w,o})=m_{s}\cdot c_{s}\cdot (T_{s,o}-T)[/tex]

Where:

[tex]m_{w}[/tex], [tex]m_{s}[/tex] - Masses of the water sample and the piece of steel, measured in kilograms.

[tex]c_{w}[/tex], [tex]c_{s}[/tex] - Specific heat of water and steel, measured in joules per kilogram-Celsius.

[tex]T_{w,o}[/tex], [tex]T_{s,o}[/tex] - Initial temperatures of the water sample and the piece of steel, measured in Celsius.

[tex]T[/tex] - Final temperature of the sample-piece system, measured in Celsius.

The final temperature is cleared:

[tex](m_{w}\cdot c_{w}+m_{s}\cdot c_{s})\cdot T = m_{w}\cdot c_{w}\cdot T_{w,o}+m_{s}\cdot c_{s}\cdot T_{s,o}[/tex]

[tex]T = \frac{m_{w}\cdot c_{w}\cdot T_{w,o}+m_{s}\cdot c_{s}\cdot T_{s,o}}{m_{w}\cdot c_{w}+m_{s}\cdot c_{s}}[/tex]

If we know that [tex]m_{w} = 1\,kg[/tex], [tex]m_{s} = 0.370\,kg[/tex], [tex]c_{w} = 4186\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]c_{s} = 460\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]T_{w,o} = 9\,^{\circ}C[/tex] and [tex]T_{s,o} = 210\,^{\circ}C[/tex], the final temperature of the system is:

[tex]T = \frac{(1\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (9\,^{\circ}C)+(0.370\,kg)\cdot \left(460\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (210\,^{\circ}C)}{(1\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)+(0.370\,kg)\cdot \left(460\,\frac{J}{kg\cdot ^{\circ}C} \right)}[/tex]

[tex]T = 16.853\,^{\circ}C[/tex]

The final temperature of the water-steel system is 16.853 ºC.

Answer:

Explanation:

When the Lewis base  (CH3)2NH reacts with Lewis acid Lewis acid (CH3CH2)3C⁺  which is also a carbocation , a new bond is formed as follows by the donation of a loan pair of electrons by the nitrogen atom of

(CH3)2NH . Here (CH3)2NH donates electrons so it acts as base and the second group accepts electrons so it is acid .

THe structure of the product formed is shown in the file attached .

Answer:

Flammability.

Explanation:

Chemical properties of a substance are properties of a substance that occur in the chemical reactions in which it is involved.  These are the basis for the classification of substances, such as metals, halogens, acids, alcohols, alkenes, arenes, etc. A class of substances is characterized by chemical properties common to that group. Differences in the chemical and physical properties of substances allow the substance to be identified, and the components of a mixture of substances to be separated and purified.

The chemical properties of a substance are its chemical stability, reactivity, oxidizability, acidity, bromine number, polymerisability, flammability, toxicity, etc. These can be determined by chemical exposure.

From the figure we can notice that the tip is ended surely before 9 cm .

Also , the tip crossed two cuts after 8 .

Therefore , it is greater than 8.2 .

Now , if we see that the tip end between 2 and 3 .

Therefore , the best estimate is 8.25 cm .

Hence , this is the required solution .

Answer:

[tex]\%F=18.967\%[/tex]

Explanation:

Hello,

In this case, a percent composition is computed by considering the atomic mass of each element in the compound as well as the number of atoms and the molar mass of the compound. Thus, Sb2F3 has a molar mass of 300.52 g/mol, antimony has an atomic mass of 121.76 g/mol and fluorine 19.0 g/mol, therefore, the percent composition of fluorine which has three atoms with five significant figures is:

[tex]\% F=\frac{3*19.0g/mol}{300.52g/mol}*100\%\\ \\\%F=18.967\%[/tex]

Best regards.

Answer:

B) is greater in cool liquid water than in warm liquid water.

Explanation:

The solubility of oxygen in water is more in cold water in comparison to warm water.

The solubility of oxygen in water depends on the temperature as in warm water, more oxygen is released while in cold water, less oxygen is released and more oxygen get dissolved.

Hence, the correct option is "B".

Answer:  is greater in cool liquid water than in warm liquid water.

Explanation:

he solubility increases with the increase in the partial pressure of oxygen at a constant temperature and concentration.

Your answer would be D.

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

mass of substance = 769.09 g

volume = 17.38 cm³

The density is

[tex]density = \frac{769.09}{17.38} \\ \equiv44.2514384...[/tex]

We have the final answer as

Hope this helps you

Answer:

1/100,000

Explanation:

its radius is only about 1/100,000 of the total radius of the atom. if an atom were the size of a football stadium, the nucleus would be about the size of a pea! Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom.

Answer:

[tex]\rho=3.1g/mL[/tex]

Explanation:

Hello,

In this case, considering that the density of a body is computed given its mass and volume:

[tex]\rho =\frac{m}{V}[/tex]

Taking into account that the mass is 24.32 g and the volume is computed via the difference between the volume of the water with the brass and the volume of water by itself as follows:

[tex]V=13.50mL-5.60mL=7.9mL[/tex]

The density of the piece of brass turns out:

[tex]\rho =\frac{24.32g}{7.9mL}\\\\\rho=3.1g/mL[/tex]

Best regards.

These elements are located in the upper right and lower left corners of the periodic table and in certain element groups. The halogens, alkali metals, and alkaline earth metals are highly reactive. The most reactive element is fluorine, the first element in the halogen group.

Answer:

[tex]Increase=98.8ppm[/tex]

[tex]Average\ increase/year=1.594\frac{ppm}{year}[/tex]

Explanation:

Hello,

In this case, since the nowadays concentration of CO2 is 414.51 ppm and the concentration in 1958 was 315.71 ppm, the total increase is computed via the difference between them:

[tex]Increase=414.51ppm-315.71ppm\\\\Increase=98.8ppm[/tex]

Moreover, the average increase per year is computed considering that from 1958 to 2020, 62 years have passed, therefore, such average is:

[tex]Average\ increase/year=\frac{98.8ppm}{62 years} \\\\Average\ increase/year=1.594\frac{ppm}{year}[/tex]

Regards.

A. The total increase in March concentration (in ppm) from 1958 to 2020 is 98.8 ppm

B. The average increase per year is 1.59 ppm / year

Increase = (Concentration in March 2020) – (Concentration in March 1958)

Increase = 414.51 – 315.71

Increase = 98.8 ppm

Increase per year = Increase / Total year

Increase per year = 98.8 / 62

Increase per year = 1.59 ppm / year

Learn more about percentage increase:

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Answer:

The nurse should administer 3995.2 millilitres of syrup.

Explanation:

The conversion factor of pound weight to kilogram is; 1 lb = 0.453592 kg

The body weight of the patient in Kg = 150 * 0.453592 = 68.04 kg

A prescription of 7.34 mg/kg acetaminophen means that he should receive;

7.34 mg * 68.04 = 499.4 mg of acetaminophen

Amount in grams of acetaminophen per millilitre of syrup = 0.125 mg

Number of millilitres of syrup required = 499.4 mg / 0.125 mg/mL = 3995.2 mL

Therefore, the nurse should administer 3995.2 millilitres of syrup.

Answer:

Explanation:

The quantity of sugar in the bar of milky chocolate of  45 g is 25 g of sugar

u can use this information to calculate the amount of the sugar in any amount .

mass of sugar in 14.630 g →

     chocolate mass                 sugar mass

         45 g                                    25 g

       14.630                                     x      

                                                            X= mass of sugar = 8.13 g

now  for 3 gram of chocolate :

          45 g                                   25 g

           3.000                                 x

    X = 1.667 grams of sugar

Given :

Radius of uranium atom , [tex]R=149\ pm = 149\times 10^{-12}\ m[/tex] .

To Find :

How many uranium atoms would have to be laid side by side to span a distance of 1.66 mm .

Solution :

Diameter of uranium atom :

[tex]D=2r=2\times 149\times 10^{-12}\ m\\\\D=298\times 10^{-12}\ m[/tex]

Number of atoms are :

[tex]n=\dfrac{D}{d}\\\\n=\dfrac{1.66\times 10^{-3}\ m}{ 298\times 10^{-12}\ m}\\\\n=5.57\times 10^{6}[/tex]

Hence , this is the required solution .

I think that it's cannot include supernatural explanations, or C.

If i got it wrong sorry  

Answer:

False

Explanation:

Carbon and Oxygen can for Carbon Monoxide (CO), Carbon Dioxide (CO2), Carbon Trioxide (CO3), etc.

Answer:

1st part:  line graph

2nd part: bar graph

Explanation:

edge, yw!

When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. Therefore, 1st part is  line graph and 2nd part is bar graph.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. 1st part is line graph and 2nd part is bar graph.

Therefore, 1st part is  line graph and 2nd part is bar graph.

To learn more about phase transition, here:

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the answer is 385 miles

Answer:

Generally intensive properties are properties that are dependent on mass

So from  the list given in the question we see that

       P => pressure

       V  =>  volume

       [tex]\rho[/tex] => density

      T => tension

Are intensive properties

Generally extensive properties are properties that are increase or decreased by mass i.e that scale with mass  i.e the are properties that their value is proportional to the quantity of matter(mass) in the system  

So from  the list given in the question we see that

       m => mass

       V =>  volume

Non -properties are

    F => Force

    a = > acceleration

     L => length

    t =>  time

     v => velocity

Explanation:

As per the question separate the P, V, F, v and rho and T a and m and L then we have intensive properties and an extensive property and a non extensive property

Learn more about the  list P, F, V, v, rho, T, a, m, L.

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Answer:

c

Explanation:

It is the weighted average of the isotopes.  For example chlorine has two common masses for 2 isotopes.

The lighter one (and most common) is 34.96885

The heavier one is                                  36.96590

Now if you take the average of these two, you get 70.92/2 = 35.46 which is not the right answer. The right answer must take into account the abundance of the two isotopes.

36.590 * 0.2447 = 8.9536

34.96885*.7553=26.4120

The total is the periodic table mass which is 35.36557

The difference may not appear to be important, but an element has a lot of isotopes with quite a difference in them, the difference might be important.

Answer: The answer is "What are the effect of low pH in soil"  

Explanation: This is because this can be tested and because it is not a opinion or a moral value. Thus this question can be tested with the scientific method.

The question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.

Science may be defined as a branch of scientific study that involves the application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence.

It can broadly be classified into three categories such as Physics, Chemistry, and biology. Each sub-classification illustrates its own field of detailed study.

Science always deals with the concept of nature as well as natural phenomena. So, among the given options, the soil is an abiotic component of nature.

The effects of low pH in the soil depend on various factors like the complexity of organisms living on a particular area, resources, pollution level, etc.

Therefore, the question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.

To learn more about Soil pH, refer to the link:

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Answer:

5.59 %

Explanation:

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

Observed value of density = 2.85 g/cm³

True value of density = 2.699 g/cm³

Percentage error =.?

The percentage error of the student can be obtained as follow:

Percentage error = |Observed value – True value|/True value × 100

Percentage error = |2.85 – 2.699|/2.699

Percentage error = 0.151/2.699 × 100

Percentage error = 5.59 %

Therefore, the percentage error of the student is 5.59 %.

Answer:

+3

Explanation:

The oxidation number of a specie is the charge that it appears to have as determined by some arbitrary rules.

If we look at the reaction, we will notice that arsenic is more electro positive than chlorine so it is likely to function as the reducing agent in the reaction, loosing three electrons to have an oxidation number of +3 in the product.

Answer:

8

Explanation:

because 14 - 6 is 8