Answer : The volume at STP will be 0.2944 L
Solution : Given,
Initial volume = 500 ml
Initial temperature =
Initial pressure = 500 mmHg =
At STP,
Temperature = 298 K
Pressure = 1 atm
Formula used :
where,
= initial pressure
= pressure at STP
= initial temperature
= temperature at STP
= initial volume
= volume at STP
Now put all the given values in this formula, we get
By rearranging the terms, we get the volume at STP
(1 L = 1000 ml)
Therefore, the volume at STP will be 0.2944 L
To find the volume of nitrogen at STP, we need to use the ideal gas law equation.
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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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:
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
An example of a solution is salt and water.
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.
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
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.
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.
Answer:
In a climatological sense, dryness is a function of both annual rainfall and evaporation