A sample of nitrogen occupies a volume of 500ml at 60 and 500 mm hg of pressure. what will its volume be at stp\

Answers

Answer 1
Answer:

Answer : The volume at STP will be 0.2944 L

Solution : Given,

Initial volume = 500 ml

Initial temperature = 60^oC=273+60=333K     (0^oC=273K)

Initial pressure = 500 mmHg = (500)/(760)=.658atm   (1atm=760mmHg)

At STP,

Temperature = 298 K

Pressure = 1 atm

Formula used :(P_1V_1)/(T_1)=(P_2V_2)/(T_2)

where,

P_1 = initial pressure

P_2 = pressure at STP

T_1 = initial temperature

T_2 = temperature at STP

V_1 = initial volume

V_2 = volume at STP

Now put all the given values in this formula, we get

((0.658atm)* (500ml))/(333K)=((1atm)* V_2)/(298K)

By rearranging the terms, we get the volume at STP

V_2=294.42ml=0.2944L        (1 L = 1000 ml)

Therefore, the volume at STP will be 0.2944 L

Answer 2
Answer:

Final answer:

To find the volume of nitrogen at STP, we need to use the ideal gas law equation.

Explanation:

To find the volume of nitrogen at STP, we need to use the ideal gas law equation. The ideal gas law equation is PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature in Kelvin. At STP, the pressure is 1 atm and the temperature is 273 K. Plug in the given values and solve for V:

V = (500 mL * 500 mmHg * (1 atm / 760 mmHg))/(0.0821 L·atm/mol·K * 333 K)

V = 162.6 mL

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270kJ are needed to keep a 75 watt light bulb burning for 1 hour. How many kilocalories are needed to burn this light bulb for 3 hours?

Answers

Answer:

For 1 hour 75w light bulb requires 270 kj  for burning

for 3 hours 75 w light bulb requires 270*3 = 810kj for burning

Explanation:

Select the correct answer.Which is an example of a solution?
O A. flour and water
O B. sand and water
O c.
salt and water
O D.
oil and water
O E. ice and water

Answers

Final answer:

An example of a solution is salt and water.


Explanation:

An example of a solution is salt and water. When salt is mixed with water, it dissolves and forms a homogeneous mixture where the salt particles are evenly distributed throughout the water.


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In compliance with conservation of energy, Einstein explained that in the photoelectric effect, the energy of a photon (hv) absorbed by a metal is the sum of the work function (Φ), the minimum energy needed to dislodge an electron from the metal’s surface, and the kinetic energy (Ek) of the electron: hv = Φ + Ek. When light of wavelength 358.1 nm falls on the surface of potassium metal, the speed (u) of the dislodged electron is 6.40 x 10⁵ m7s. (a) What is Ek (½mu²) of the dislodged electron? (b) What is Φ (in J) of potassium?

Answers

Answer:

 a) 1.866 × 10 ⁻¹⁹ J      b)   3.685 × 10⁻¹⁹ J

Explanation:

the constants involved are

h ( Planck constant) = 6.626 × 10⁻³⁴ m² kg/s

Me of electron = 9.109 × 10 ⁻³¹ kg

speed of light = 3.0 × 10 ⁸ m/s

a) the Ek ( kinetic energy of the dislodged electron) = 0.5 mu²

Ek = 0.5 × 9.109 × 10⁻³¹ × ( 6.40 × 10⁵ )² = 1.866 × 10 ⁻¹⁹ J

b) Φ ( minimum energy needed to dislodge the electron ) can be calculated by this formula

hv =   Φ + Ek

where Ek = 1.866 × 10 ⁻¹⁹ J

v ( threshold frequency ) = c / λ where c is the speed of light and λ is the wavelength of light = 358.1 nm = 3.581 × 10⁻⁷ m

v = ( 3.0 × 10 ⁸ m/s ) / (3.581 × 10⁻⁷ m ) = 8.378 × 10¹⁴ s⁻¹

hv = 6.626 × 10⁻³⁴ m² kg/s ×  8.378 × 10¹⁴ s⁻¹ = 5.551 × 10⁻¹⁹ J

5.551 × 10⁻¹⁹ J = 1.866 × 10 ⁻¹⁹ J + Φ

Φ = 5.551 × 10⁻¹⁹ J - 1.866 × 10 ⁻¹⁹ J = 3.685 × 10⁻¹⁹ J

Which of the following statements regarding redox reactions is true? Which of the following statements regarding redox reactions is true? Redox reactions are only seen in the electron transport chain. Redox reactions involve an oxidation reaction coupled with a reduction reaction. No metabolic reactions are redox reactions. Redox reactions must either be oxidizing reactions or reducing reactions.

Answers

Answer:

Redox reactions involve an oxidation reaction coupled with a reduction reaction.

Explanation:

A redox reaction is called like that because it involves a substance that is reducing and a substance that is oxidating, so it is Re-dox, this means that all of the chemicals reactions that involve a substance that looses an electron, are redox reactions, they are present in almost all of chemistry, from syntetic to biological chemistry, so the only correct option would be:

Redox reactions involve an oxidation reaction coupled with a reduction reaction.

Answer: An oxidation reaction is defined as the when in a reaction the oxidation number of a species involved increased, and reduction reaction is reversed, it when the oxidation number of a species is decreased. And a redox reaction is in which both of oxidation and reduction reaction takes place simultaneosly. Because chemical reaction follows the law of conservation of mass.

The element oxygen has valence electrons

Answers

Answer:

it’s electron configuration is 1s^2 2s^2 2p^4. To determine valence electrons, add the outermost s and p orbitals. In an oxygen atom, 8 electrons are present. Electron present in the first shell (n=1) 2n^2=2 (1)^2=2 (1)=2.

In a climatological sense, dryness is a function of both annual rainfall and ________.This a geology question.

Answers

Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

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