at what pressure does water boil at room temperature 25 ec

Answers

Answer 1

Answer:      approximately 100 degrees Celsius


Related Questions

Determine the molarity of a solution prepared by dissolving 0.198 g of "KHP" (C8H5O4K) in enough water to make 125 mL of solution.
When the solution is found and titrated with aqueous sodium hydroxide, the endpoint is reached after the addition of 27.80 mL of base solution. How many moles of NaOH reacted? What is the concentration of the NaOH?

Answers

Answer:

0.007756M KHP; 0.0009695 moles NaOH reacts; 0.03488M NaOH.

Explanation:

Potassium hydrogen phthalate, KHP, is a salt used as standard to determine concentration of basic solutions as NaOH solutions.

To find molarity of the KHP solution we need to convert mass of KHP to moles and divide this in 125mL = 0.125L:

Moles KHP -Molar mass: 204.22g/mol-:

0.198g * (1mol / 204.22g) = 0.0009695 moles KHP

Molarity:

0.0009695 moles KHP / 0.125L = 0.007756M KHP

NaOH reacts with KHP as follows:

NaOH + KHP → Na⁺ + KP⁻ + H₂O

That means 1 mole of NaOH reacts per mole of KHP, that means moles of NaOH that reacts are = Moles of KHP added:

0.0009695 moles NaOH reacts

In 27.80mL = 0.02780L the NaOH was contained. Molarity is:

0.0009695 moles NaOH / 0.02780L =

0.03488M NaOH

Moles of NaOH added will be "0.034".

According to the question,

→ [tex]Molarity = \frac{Number \ of \ moles}{Volume}[/tex]

By substituting the values, we get

                  [tex]= \frac{0.198}{204}\times \frac{1000}{125}[/tex]

                  [tex]= 0.0077 \ M[/tex]

Let,

The number of moles added be "[tex]M_2[/tex]".

Now,

→            [tex]M_1 V_1 = M_2 V_2[/tex]

→ [tex]0.0077\times 125=M_2\times 27.8[/tex]

→                [tex]M_2 = 0.034 \ moles[/tex]

Thus the above answer is appropriate.

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how many sodium ions are in 1.4 kg of sodium chloride, NaCl?

Answers

Answer:

1.44 x 10²⁵ ions of Na⁺

Explanation:

Given parameters:

Mass of NaCl  = 1.4kg  = 1400g

Unknown:

Number of ions of sodium  = ?

Solution:

The compound NaCl in ionic form can be written as;

      NaCl →  Na⁺ + Cl⁻

In 1 mole of NaCl we have 1 mole of sodium ions

 Now, let us find the number of moles in NaCl;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

    Molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

Number of moles  =  [tex]\frac{1400}{58.5}[/tex]     = 23.93mol

 So;

   Since 1 mole of NaCl gives 1 mole of Na⁺  

    In 23.93 mole of NaCl will give 23.93 mole of Na⁺

1 mole of a substance  = 6.02 x 10²³ ions of a substance

  23.93 mole of a substance  =  6.02 x 10²³ x  23.93

                                                   = 1.44 x 10²⁵ ions of Na⁺

Which of the following examples of erosion would occur most quickly?
OA. A river erodes sediment to form a canyon.
ОВ.
A glacier carves out a path as it moves.
OC. A wind storm moves sand from one area to another
OD
Ocean waves erode a large rocky cliff.

Answers

Answer: OC

Explanation:

The Others Could Take Many Millions Of Years

Which of the following best defines climate)_( Short-term atmospheric conditions of a region Ob The weather pattern of an area over two weeks or less Average weather conditions of a region over the long term Od A pattern of weather that never changes​

Answers

Answer:

Average weather conditions of a region over the long term

Explanation:

Climate is the long-term average of weather, typically averaged over a period of 30 years. More rigorously, it denotes the mean and variability of meteorological variables over a time spanning from months to millions of years.

In order to make 159 ml of a 0.135 M benzoic acid solution, what mass of benzoic acid (C7H6O2) is required?

Answers

Answer:

Explanation:

159 mL of .135 M benzoic acid will contain

.159 x .135 = .021465 moles of benzoic acid.

Molecular weight of benzoic acid = 122 gm

grams of .021465 moles = 122 x .021465 = 2.6 grams .

So 2.6 grams of benzoic acid will be required .

How much of the sulfur burnt is normally oxidized to hexavalent state?
A. 35 to 50%
B. 100%
C. 2 - 100%
D. 98%

Answers

I feel that it is D but I am not 100% sure sadly.

In a titration, you start with 0.05 M sodium hydroxide (NaOH) and slowly add it to 40 mL of HC1 with an unknown concentration. What is the original concentration of the HC1 if you add a total of 15.4 mL of sodium hydroxide to the HC1 to achieve pH =7?

Answers

Answer:

The original concentration of the HCl is: 0.01925 M

Explanation:

Equation:

HCl+NaOH-------> NaCl+H₂O

Volume of NaOH added = 0.05 M

No of moles of NaOH = 15.4 mL [tex]x\frac{1 L}{1000 mL} x\frac{0.05 mol NaOH}{L}[/tex]

= 0.00077 mol NaOH

Then,

Volume of HCl solution = 40 mL x 1/1000 mL

= 0.0400 L

Therefore,

Concentration of HCl = 0.00077 mol/0.0400 L

= 0.01925 M

Now, to find the pH:

pH = -log₁₀[H⁺]

     = -log₁₀(2x10⁻⁶)

     = 5.7

Add oxidation numbers to the following reaction: 2 H3PO4 (aq) + 2 Cr(s) → 2 CrPO4 (aq) + 3 H2(g). Identify the atom that is oxidized and identify the oxidizing agent.

Answers

The atom that is oxidized : Cr

The oxidizing agent : H₃PO₄

Further explanation

Reaction

2 H₃PO₄ (aq) + 2Cr(s) → 2 CrPO₄ (aq) + 3H₂(g)

Atoms undergoing a reduction reaction (decrease in oxidation number) and an oxidation reaction (increase in oxidation number)

Reduction (+1 to 0)

H⁺(in H₃PO₄) =+1

H₂=0

Oxidation (0 to +3)

Cr = 0

Cr³⁺(in CrPO₄ )

the oxidizing agent.⇒which undergoes a reduction reaction and oxidizes another compound/element : H₃PO₄

A common misconception people have is that sugar is energy and energy is sugar but you know better. Give me ideas of a clear explanation that could be used to clear up this misconception, please?????!!!!!!

Answers

for a human to survive we require amounts of glucose which is readily found in sugar. example-when people say their sugar levels are low they tend to be more exhausted and less energetic. this is actually a lack of glucose in the body and can be replaced by ingesting a amount of it. however glucose isn’t only found in sugar but can be found in a variety of foods. so sugar doesn’t give us energy - it’s the glucose within it.

Titration of a strong acid with a strong base. The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid with a 0.100 M solution of NaOH(aq). What volume of NaOH(aq) would be needed to reach the equivalence point if the concentration of the added base were 0.240 M?

Answers

Answer:

Explanation:

we know that M1V1=M2V2

M1=0.100 M

V1=50.0*10^-3 L

M2=0.100 M

V2=M1V1/M2

V2=0.100*50.0*10^-3/0.100

V2=0.05

To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen. The volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.240 M is 20.8ml.

What is titration?

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known.

The balanced equation is

HCl+NaOH[tex]\rightarrow[/tex]NaCl+H₂O

Using following equation

M₁×V₁=M₂×V₂

Where,

M₁=molarity of HCl= 0.100 M

V₁=volume of HCl=50.0 mL

M₂=molarity of NaOH=0.240 M

V₂=volume of NaOH=?

Substituting the given values

0.100 M ×50.0 mL=0.240 M×V₂

V₂=20.8ml

Therefore, the volume of NaOH needed to reach the equivalence point if the concentration of the added base were 0.240 M is 20.8ml.

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How are protons, neutrons, and electrons arranged to form an atom?

Answers

Answer:

Protons are in the middle, electrons are on the loop (outside area) and the neutrons are mixed with the protons.

Explanation:

Answer:

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). Atoms are made up of protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.

Explanation:

Ammonia gas(NH3) and oxygen(O2) gas react to form nitrogen gas and water vapor. Suppose you have 2.0 mol of and 13.0 mol of O2 in a reactor. Calculate the largest amount of that could be produced. Round your answer to the nearest .

Answers

Answer:

[tex]n_{H_2O}=3.0molH_2O\\\\n_{N_2}=1.0molN_2[/tex]

Explanation:

Hello!

In this case, for the described reaction we have:

[tex]2NH_3(g)+\frac{3}{2} O_2(g)\rightarrow N_2(g)+3H_2O(g)[/tex]

Which means there is 2:3/2 mole ratio between ammonia and oxygen and we use it to compute the consumed moles of ammonia by 13.0 moles of oxygen as shown below:

[tex]n_{NH_3}^{consumed \ by\ O_2}=13.0molO_2*\frac{2molNH_3}{\frac{3}{2}molO_2 } =17.33molNH_3[/tex]

However, since just 2.0 mol of ammonia is available, we infer it is the limiting reactant and the maximum amount of both nitrogen and water that can be produced is computed below:

[tex]n_{H_2O}=2.0molNH_3*\frac{3molH_2O}{2molNH_3} =3.0molH_2O\\\\n_{N_2}=2.0molNH_3*\frac{1molN_2}{2molNH_3} =1.0molN_2[/tex]

Best regards!

Balance the following equations ___Fe + __O2= ___Fe3O4

Answers

3Fe + 2O2 = Fe3O4

There needs to be the same amount of each element on each side of the equation !

A gas at -20c occupies volume 140 ml calculate temperature at which the volume of the gas becomes 65 ml pressure constant

Answers

Answer:

–156 °C

Explanation:

The following data were obtained from the question:

Initial temperature (T1) = –20 °C

Initial volume (V1) = 140 mL

Final volume (V2) = 65 mL

Final temperature (T2) =?

Pressure = constant.

Next, we shall convert –20 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T1) = –20 °C

Initial temperature (T1) = –20 °C + 273 = 253 K.

Next, we shall determine the new temperature of the gas as follow:

Initial temperature (T1) = 253 K

Initial volume (V1) = 140 mL

Final volume (V2) = 65 mL

Final temperature (T2) =?

V1/T1 = V2/T2

140/253 = 65/T2

Cross multiply

140 × T2 = 253 × 65

140 × T2 = 16445

Divide both side by 140

T2 = 16445 /140

T2 = 117 K

Finally, we shall convert 117 K to celcius temperature. This can be obtained as follow:

T(°C) = T(K) – 273

T2 = 117 K

T2 = 117 K – 273

T2 = –156 °C

Thus, the new temperature of the gas is –156 °C

Sugar and Salt in water magnetism, state of matter, or solubility?
please help!!!!​

Answers

Answer:

solubility

Explanation:

Answer is solubility

Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?

Answers

Answer:

π = 7.33atm

Explanation:

Osmotic pressure is defined as the pressure that must be applied to stop the mass transfer when a semipermeable membrane separates it of pure water. The equation is:

π = M×R×T

Where P is osmotic pressure

M is molar mass = 0.30M

R is gas constant = 0.082atmL/molK

And T is absolute temperature = 25°C + 273.15 = 298.15K

π = 0.30M×0.082atmL/molK×298.15K

π = 7.33atm

Osmotic pressure of human blood at 25 degree C or at absolute temperature is equal to 7.33 atm.

What is osmotic pressure?

It is defined as the minimum pressure exerted on the solution, which is required to stop the flow of pure solvent from low concentration to high concentration through the semi permeable membrane.

Osmotic pressure can be calculted as :

P = M × R × T

Where, P = Osmotic pressure

M = Molar mass = 0.30 M (given)

R = Universal gas constant = 0.082 atmL/molK

T = Absolute temperature 25 degree C = 25⁰C + 273.15 = 298.15 K

Putting all these values in the given equation, we get:

P = 0.30 × 0.082 × 298.15 = 7.33 atm

Hence, 7.33 atm is the osmotic pressure of blood at 25⁰C .

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What is electronegativity and which chemical family has
the strongest electronegativity according the the Periodic
Trends?

Answers

Answer:

Of the main group elements, fluorine has the highest electronegativity (EN = 4.0) and cesium the lowest (EN = 0.79). This indicates that fluorine has a high tendency to gain electrons from other elements with lower electronegativities.

Explanation:

Complete the balanced molecular chemical equation for the reaction below.

If no reaction occurs, write NR after the reaction arrow.

Cu2SO4(aq) + Li3PO4(aq)

Answers

Answer:

Following are the complete balance of the given equation:

Explanation:

Given equation:

[tex]Cu_2SO_4(aq) + Li_3PO_4(aq)[/tex]

[tex]Cu_2So4\ (aq)+Li_3Po_4 \(aq) \longrightarrow Cu_3(Po_4)\ (aq)+Li_2So_4 \ (aq)[/tex]

After Balancing the equation:

[tex]3 Cu_2So4\ (aq)+ 2 Li_3Po_4\ (aq) \longrightarrow 2 Cu_3(Po_4)\ (aq)+ 3Li_2So_4 \ (aq)[/tex]

In the above equation, when the 3 mol Copper sulfate reacts with 2 mol lithium phosphate , it will produce 2 mol Copper phosphate  and 3 mol Lithium sulfate .

When you apply heat energy to a substance, where does the energy go? Think about the law of conservation of energy.

Answers

Answer:

the heat energy is transformed to any kind of energy depending on what it's meant to be transformed to.

remember it cannot be destroyed so it's definitely transformed to some kinda energy

H20+ SO3 ? Which compound is likely produced by the chemical reaction?​

Answers

Answer:

h2so4

Explanation:

im big brain.

Is there anyone studying a doctor in pharmacy?​

Answers

Answer:

no I am in 8 standard

I am already preparing for a doctor for my future

A patient provides a urine sample. The density of the patient's urine is 1.0192 g/mL. What is the specific gravity of the urine?

Answers

Answer:

1.092

Explanation:

Density = 1.0192 g/mL

oecific gravity = ?

Specific gravity is the ratio of a material's density with that of water.

The density of water at 4 degrees Celsius =  1 g/mL

Specific gravity = 1.0192 / 1 = 1.0192

Because specific gravity is a ratio, it has no dimension.

What do chemical compounds want to obey?

Answers

Answer:

Their atoms obey the octet rule

Explanation:

Chemical compounds are formed when atoms combine with one another in order to comply with the octet rule. The octet configuration gives an atom stability in electronic structure.

When atoms become isoelectronic with noble gases, it confers a special stability on them. Therefore, to attain this state, they gain or lose electron or share their electrons with other species.


Weathering is a constructive process.
True or false

Answers

Answer: true

Explanation: Collection and analysis of data indicates that constructive forces include crustal deformation, faulting, volcanic eruption and deposition of sediment, while destructive forces include weathering and erosion.

Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the amount of Ga(s) that can be deposited from a Ga(III) solution using a current of 0.710 A that flows for 60.0 min.

Answers

Answer:

0.00883 mol

Explanation:

Let's consider the reduction reaction of gallium.

Ga³⁺(aq) + 3 e⁻ ⇒ Ga(s)

We can establish the following relationships:

1 min = 60 s1 A = 1 C/s1 mole of electrons have a charge of 96486 C (Faraday's constant)When 3 moles of electrons circulate, 1 mole of Ga is deposited

The amount of Ga deposited using a current of 0.710 A that flows for 60.0 min is:

[tex]60.0min \times \frac{60s}{1min} \times \frac{0.710C}{s} \times \frac{1mole^{-} }{96486C} \times \frac{1molGa}{3mole^{-}} = 0.00883 molGa[/tex]

What is the answer? Please

Answers

Answer:

Leeunwenhoek

Explanation:

Anton Von Leeunwenhoek was the first scientist to observe live cells and in greater details. He described spirogyra in the mid 15th century.

His contribution to the scientist community opened up the world of micro-organisms. He produced several microscopes to observed the world of micro-organisms that we cannot see with our naked eyes. He also studied plants extensively.

If element X has 6 valence electrons, what is the formula between element X and
magnesium.
a. X6Mg2
b. MgX3
c. MgX
d. XMg

Answers

I think it’s b but I could be wrong

Copper coins turn green when exposed to water. What happens to this chemical reaction if the coins are heated?
1.The coins will turn green slower because chemical reactions slow down with higher temperatures
2.The coins will turn green faster because chemical reactions speed up with higher temperatures
3.The coins will turn green at the same rate as before because temperature has no affect on the speed of chemical reactions
4.The coins will not turn green, algae cannot survive in hot temperatures​

Answers

Answer:

The coins will turn green faster because chemical reaction speed up with higher temperatures

Copper coins turn green when exposed to water because the coins will turn green faster because reaction speeds up with higher temperatures.

What is the rate of the chemical reaction?

The rate of a chemical reaction can be defined as the speed at which the products are formed from the reactants. The rate of a reaction gives information about the time frame under which a reaction can be finished.

The rate of reaction can be described as the speed of a chemical reaction at which reactants are transformed into products. Some chemical reactions are generally instantaneous, while some reactions take time to reach the final equilibrium. Pressure increases the concentration of gaseous reactants resulting in an increase in the rate of reaction.

The rate of reaction will increase with an increase in the temperature of the reaction as the reactant molecules get more kinetic energy and increase the number of collisions.

Therefore, copper coins will turn green faster because reactions speed up with higher temperatures.

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A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?(Graph)

Answers

Explanation:

The pressure will decrease but the volume remains constant

You have two pure substance that you cannot identify. Each sample is solid at room temperature. Describe at least five steps in the appropriate sequence that you would take to be able to identify the substance. ​

Answers

Answer:

pue like ad

Explanation:

For the two pure substance that you cannot identified , The steps taken in the right sequence are:

When two pure substance are places before you. you have to visually anaylse the sample, note the various colors that they have. It can tell you if it's an anions or cations.

You can use reactants to precipitate the cations of the sample you have

We then add a reactant to the sample and you did not see any precipitate, it corresponds to any of the elements or compound. If you do not see a precipitate, you can add other reactant.

You then observe the color of this precipitate. example if the color changes to green, it will tell you that the substance is Ni(OH)₂ etc.

One can also find out through the melting and boiling point of the two substances.

Pure substance are regarded as substance that does not have impurities. one common way of finding out the purity of a substance is by its melting and boiling point determination.

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