The table below shows the vapor pressure of water at various temperatures.
Temp(degC) Vapor Pressure (mmHg)
17
14.5
18
15.5
19
16.5
20
17.5
21
18.7
22
19.8


During an experiment 675 mL of helium gas is collected over water at 22 degC. The air pressure in the lab is 0.926 atm. What is the partial pressure of the dry helium collected?

Initial solution concentration of the original sulfuric acid solution is 1.66.

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Answer:

b

Explanation:

Metals are elements that are good conductors of electric current and heat. They also tend to be shiny and bendable – like copper wire. The majority of elements in the periodic table are metals. They begin on the left side and extend across the periodic table.

Answer:

474 nm or 4.74 x 10^2 nm

Explanation:

c = λv

c (speed of light) = 2.998 x 10^8 m/s

λ = ?

v = 6.32 × 1014 Hz = 6.32 × 1014 1/s

2.998 x 10^8 m/s = (λ)(6.32 × 10^14 1/s)

λ = (2.998 x 10^8 m/s) / (6.32 × 10^14 1/s)

λ = 4.74 x 10^-7 m

λ = 4.74 x 10^-7 m x (1 x 10^9 nm/1 m) = 474 nm

Answer:

Explanation:

a ) one mole = 6.02 x 10²³ atoms

no of moles in given no of atoms

= 8 x 10⁹ / 6.02 x 10²³

= 1.329 x 10⁻¹⁴ moles .

b ) one mole of calcium = 40 gram

102 .5 g calcium

= 102 .5 / 40 moles

= 2.5625 moles

c )

no of moles in 5.04 g lead = 5.04 / 207

= 2.4347 x 10⁻² moles

= 2.4347 x 10⁻²x 6.02 x 10²³ no of atoms of lead

= 14.6568 x 10²¹ no of atoms .

d)  

one mole = 6.02 x 10²³ atoms

2.85 mole = 17.157 x 10²³ atoms .

e )

moles of fluorine gas = 1.08 x 10³ / 6.02 x 10²³

= .1794 x 10⁻²⁰ moles

mass in grams =  .1794 x 10⁻²⁰ x 38

= 6.8172 x 10⁻²⁰ grams

f )

no of moles in .584 g of benzene = .584 / 78

= 7.487 x 10⁻³ moles

no of molecules = 6.02 x 10²³ x  7.487 x 10⁻³

= 45.07 x 10²⁰ molecules .

g )

moles of atoms = 5.09 x 10⁹ / 6.02 x 10²³

= .8455 x 10⁻¹⁴ moles

mass in gram = .8455 x 10⁻¹⁴ x 1

=  .8455 x 10⁻¹⁴ g

h )

.45 moles of Ca₃PO₄ = .45 x 6.02 x 10²³ molecules

= 2.709 x 10²³ molecules of Ca₃PO₄

no of atoms of Ca = 3 x 2.709 x 10²³

= 8.127 x 10²³ atoms of Ca .

The identity of the metal is Magnesium, Mg

Let the unknown metal be M

Pressure (P) = 1 atm

Temperature (T) = 25 °C = 25 + 273 = 298 K

Volume (V) = 9.51 mL = 9.51 / 1000 = 0.00951 L

Gas constant (R) = 0.0821 atm.L /Kmol

PV = nRT

1 × 0.00951 = n × 0.0821 × 298

0.00951 = n × 24.4658

Divide both side by 24.4658

n = 0.00951 / 24.4658

M + 2HCl —> MCl₂ + H₂

From the balanced equation above,

1 mole of M reacted to produce 1 mole of H₂.

Therefore,

3.89×10¯⁴ mole of M will also react to 3.89×10¯⁴ mole of H₂.

Mass of metal = 9.4 mg = 9.4×10¯³ g

Mole of metal = 3.89×10¯⁴

Molar mass = mass / mole

Molar mass of metal = 9.4×10¯³ / 3.89×10¯⁴

Comparing the molar mass of the metal with those in the periodic table, the identity of the metal is Magnesium, Mg

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Answer:

the molar mass of propane (c3H8) is

12*3+1*8

=36+8=44

Answer:

A precipitate will form when a freshly prepared aqueous carbonic acid solution is added to an aqueous solution of Calcium Hydroxide.

Explanation:

A precipitate will form when a freshly prepared aqueous carbonic acid

solution reacts with an aqueous solution of Calcium Hydroxide

Ca(OH)₂ + H₂CO₃ → CaCO₃ + 2 H₂O

This is an example of a neutralization reaction between the acid ( H₂CO₃)

and a base ( Ca(OH)₂ ) to form a precipitate known as Calcium

carbonate(CaCO₃).

The product which is Calcium carbonate(CaCO₃) is also referred to as calcite

or chalk.

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Answer:

Hi! there

Explanation:

Heroine is a opiate drug that is synthesized from morphine . Morphine is a naturally ocurring substance found in the seed of the Asian poppy plant.

        yes, heroine change appetite . One of the noticeable side effect is rapid change in body weight . It can cause both dramatic increases and decreases in appetite and weight depending on the individual through its effects on the GI  system - like appetite changes and nausea or vomiting , excessive sleeping , restlessness etc .

Hope that you like it ! Thankyou

At the usual working conditions of 101.5 kPa and 21°C, the chemical oxygen generator system would generate roughly 220.84 litres of oxygen using 500 g of LiClO4.

We may use the ideal gas law and stoichiometry to calculate how many litres of oxygen are created by the chemical oxygen generator system employing 500 g of LiClO4.

We must first determine the moles of LiClO4. LiClO4 has a molar mass of approximately 106.39 g/mol. As a result, 4.704 mol of LiClO4 are produced from 500 g of LiClO4 using the formula: 500 g / 106.39 g/mol

We can see from the chemical equation that 1 mole of LiClO4 results in 2 moles of O2. 4.704 mol of LiClO4 will therefore result in:

2 mol O2 / 1 mol LiClO4 4.704 mol LiClO4 = 9.408 mol O2

The moles of O2 under the specified conditions must then be converted to volume. The ideal gas law, which goes as follows:

PV = nRT

Where:

P = pressure = 101.5 kPa

V = volume (in liters)

n = moles of gas = 9.408 mol

R = ideal gas constant = 8.314 J/(mol·K)

T = temperature = 21°C = 294 K (converted to Kelvin)

Rearranging the equation to solve for V:

V = (nRT) / P

V = (9.408 mol × 8.314 J/(mol·K) × 294 K) / (101.5 kPa × 1000 Pa/kPa)

Simplifying the units:

V = (9.408 × 8.314 × 294) / 101.5

V ≈ 220.84 liters

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Answer:

446 mmHg

Explanation:

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

Total pressure (Pₜ) = 871 mmHg

Partial pressure of He (Pₐ) = 281 mmHg

Partial pressure of N₂ (P₆) = 144 mmHg

Partial pressure of O₂ (P꜀) =?

The partial pressure of O₂ can be obtained as follow:

Pₜ = Pₐ + P₆ + P꜀

871 = 281 + 144 + P꜀

871 = 425 + P꜀

Collect like terms

P꜀ = 871 – 425

P꜀ = 446 mmHg

Therefore, the partial pressure of O₂ in the mixture is 446 mmHg

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

Answer:

1.c

2.c

3.a

4.b

5.a

i think that's the answer

Answer:

Keep the world safe and clean

Explanation:

safety = keep people inline and help them from making bad decisions

clean = keep the world from being polluted or trashy

Astronomy deals with the study of celestial objects such as moon, stars, sun, planets, etc.

Safety is the art of being protected from danger

Recycling is the process of waste conversion. That is, useful materials are generated from wastes.

Astronomers, in their exploration of extraterrestrial bodies, need to ensure that proper measures are taken to ensure their safety in these locations. Unhealthy practices such as deforestation and indiscriminate waste disposal may cause environmental hazards such as global warming. This is a threat to the atmosphere.

Therefore, wastes have to be converted to reusable products to discourage indiscriminate disposals. Hence the importance of the terms "safety" and "recycling" in astronomy.

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Answer:

Iron

Hope this helps! Stay safe!

(Plz vote me as brainliest)

Answer:iron

Explanation:

The percent by mass of nitrogen in ammonia (NH3) is approximately 82.15%

Calculating the mass of nitrogen to the total mass of the compound and then expressing the result as a percentage will allow us to determine the percent by mass of nitrogen in NH3 (ammonia).

Ammonia's molecular structure, NH3, indicates that it is made up of one nitrogen atom (N) and three hydrogen atoms (H). We must take both the molar masses of nitrogen and ammonia into account when calculating the percent by mass of nitrogen.

Nitrogen's (N) molar mass is roughly 14.01 g/mol. The molar masses of nitrogen and hydrogen are added to determine the molar mass of ammonia (NH3). Since hydrogen's molar mass is around 1.01 g/mol, ammonia's molar mass is:

(3 mol H 1.01 g/mol) + (1 mol N 14.01 g/mol) = 17.03 g/mol = NH3.

Now, we can use the following formula to get the nitrogen content of ammonia in percent by mass:

(Mass of nitrogen / Mass of ammonia) / 100% is the percentage of nitrogen by mass.

Ammonia weighs 17.03 g/mol and contains 14.01 g/mol of nitrogen by mass. By entering these values, we obtain:

(14.01 g/mol / 17.03 g/mol) 100% 82.15 % of nitrogen by mass

Ammonia (NH3) has a nitrogen content that is roughly 82.15 percent by mass.

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Answer:

Explanation:

40/ 180.2 x (-16 / 1 mole glucose)=-3.6 KJ

In an aqueous solution of ethanol, C₂H₅OH, the molecules that would be present in the solution are ethanol molecules and water molecules.

Aqueous solutions are solutions containing water as the solvent of the solution.

An aqueous solution simply means dissolved in water.

When dissolved in water, ionic compounds dissociate to form ions in aqueous solutions.

Other polar solutes which are non-ionic will simply dissolve in water as a result of the interaction of the polar ends of the molecules. However, no ions will be formed by these polar non-ionic solutes.

For example, a solution of ethanol in water is a non-ionic aqueous solution.

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Answer:

B.

Explanation:

Can you give me brainliest? i need to rank up

Answer:

2nd One is correct

Answer:

Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top.

Explanation:

The pumpkin seeds have to wrap in the towel and wet the towel slightly then place it in a warm place. The pH condition should be about neutral.

The seed germination of every plants need optimum sunlight and temperature. As well they must be provide with wet condition if requires. The optimum temperature for pumpkin seed germination is 15 -16 degree Celsius.

High humidity and high temperature are reported to be good condition for pumpkin seed germination. Hence, the air must not be too dry.

First wrap the seeds in a sand paper towel and soak the seeds in warm water for 2- 3 hours. 6 inch peat pot is generally used to plant the seeds. And do not place them in very deeper soil moisture.

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Answer: The answer is the ''The moon is always lit up by the sun for us to see.''

Explanation: The moon is directly illuminated by the sun.

Answer: Having a medical condition affect the delivery of molecules to cells in the body because your body may not receive sufficient oxygen or glucose or amino acid molecules which in turn will not allow for it to preform properly. A person may experience fatigue, or difficulty breathing, or he or she may not be producing enough of a certain hormone.

Explanation:

A medical condition can affect the delivery of molecules to cells in the body due to the inability of the body cells to function properly.

A medical condition refers to a condition that deviated from a normal state of mind. Most especially, it could be an illness, disease, or disorder.

When the body is infected with a disease or illness, the immune system will not be able to recognize or fight disease-causing organism which is usually known as pathogens.

Cells become weak and they don't perform their required activates such as the:

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Answer:

\(M_{K^+}=4.0M \\\\M_{SO_4^{2-}}=2.0M\)

Explanation:

Hello!

In this case, since the molarity of a solution is defined as the moles of solute divided by the volume of solution liters, given the mass of potassium sulfate, we can compute the moles by using its molar mass (174.24 g/mol):

\(n_{K_2SO_4}=87gK_2SO_4*\frac{1molK_2SO_4}{174.27gK_2SO_4} =0.50molK_2SO_4\)

Thus, since one mole of potassium sulfate has two moles of potassium ions (K₂) and one mole of sulfate ions, we can compute the moles of each ion as shown below:

\(n_{K^+}=0.50molK_2SO_4*\frac{2molK^+}{1molK_2SO_4}=1.0molK^+\\\\ n_{SO_4^{2-}}=0.50molK_2SO_4*\frac{1molSO_4^{2-}}{1molK_2SO_4}=0.50molSO_4^{2-}\\\)

In such a way, the molarity of each ion turns out:

\(M_{K^+}=\frac{1.0mol}{0.250L}=4.0M \\\\M_{SO_4^{2-}}=\frac{0.5mol}{0.250L}=2.0M\)

Best regards!

Answer:

woowwwww.... ur right Imao

Explanation:

Shower thoughts be like*

7.19 is pKnet for the net reaction in which water plus dissolved carbon dioxide form hydrogen ions plus bicarbonate ions

The balanced reaction would be: H+ + HCO₃- ⇌ H₂CO₃

The equilibrium constant for the reaction is:

Keq = [H₂CO₃]/[H+][HCO₃-] = 10^(pKnet) = 7.94 × 10⁻⁷

Using the equilibrium constant, we can set up an expression for x:

Keq = [H₂CO₃]/[H+][HCO₃-] = x/[(2.48 × 10⁻² - x)(1.8 × 10⁻²)]

x = 6.43 × 10 ⁻⁸ M

Therefore, the final concentration of H+ is 6.43 × 10⁻⁸ M, and the pH is:

pH = -log[H+] = -log(6.43 × 10⁻⁸) = 7.19

So the pH decreases from the average value of 7.4 to 7.19

The acidity or basicity of a solution is measured by its pH. It is the concentration of hydrogen ions in the solution as a negative logarithm (base 10) The pH scale ranges from 0 to 14, with 0 representing the most acidic condition, 7 representing neutral conditions, and 14 representing the most basic.

The total amount of dissolved inorganic carbon in a solution, including bicarbonate ions and carbon dioxide , is referred to as the carbonate pool. Blood plasma contains the carbonate pool, which serves as a buffer and contributes to pH stability in biological systems.

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