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3 years ago

Can sombody pls help me with this

Chemistry

1 answer:

luda_lava [24]3 years ago

6 0

Wouldn’t it be half of each? For 36 I guess is 18 and 54 will be 27, (NOT SURE)

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A person walks at 2 km/h for four hours. What is their displacement?

Masteriza [31]

Answer:

4km

Explanation:

3 0

3 years ago

15A.4(a) What is the temperature of a two-level system of energy separation equivalent to 400 cm−1 when the population of the up

maksim [4K]

Answer:

T = 525K

Explanation:

The temperature of the two-level system can be calculated using the equation of Boltzmann distribution:

$\frac{N_{i}}{N} = e^{-\Delta E/kT}$ (1)

where Ni: is the number of particles in the state i, N: is the total number of particles, ΔE: is the energy separation between the two levels, k: is the Boltzmann constant, and T: is the temperature of the system

The energy between the two levels (ΔE) is:

$\Delta E = hck$

where h: is the Planck constant, c: is the speed of light and k: is the wavenumber

$\Delta E = 6.63\cdot 10^{-34} J.s \cdot 3\cdot 10^{8}m/s \cdot 4 \cdot 10^{4}m^{-1} = 7.96 \cdot 10^{-21}J$

Solving the equation (1) for T:

$T = \frac{-\Delta E}{k \cdot Ln(N_{i}/N)}$

With Ni = N/3 and k = 1.38x10⁻²³ J/K, the temperature of the two-level system is:

$T = \frac{-7.96 \cdot 10^{-21}J}{1.38 \cdot 10^{-23} J/K \cdot Ln(N/3N)} = 525K$

I hope it helps you!

3 0

3 years ago

Sxdcfvbnm,.lkjhgfdsdfghjkl

tankabanditka [31]

daRfwrqesafafawrfasf thats your answer yw

7 0

3 years ago

What is a scientific question that can be asked about the insect in the photo?

bija089 [108]

The answer is " Does the butterfly primarily visit orange flowers?"

A good scientific question has certain attributes. It ought to have a few answers, ought to be testable. A scientific question is an inquiry that may prompt a speculation and help us in noting the explanation behind some perception. It is an inquiry that may prompt a speculation and help us in noting the explanation behind some perception.

7 0

3 years ago

A reaction has a ΔH value of +120 kJ and a ΔS value of -42 J/K. At which of the following temperatures is the reaction spontaneo

ollegr [7]

Answer:

the reaction is spontaneous at T > 2900 K

Explanation:

ΔG = ΔH - TΔS

∴ ΔH = +120 KJ

∴ ΔS = (-42 J/K)*(KJ/1000 J) = -0.042 KJ/K

∴ ΔG < 0 ⇒ the reaction is spontaneous

⇒ at T = 2900 K:

⇒ ΔG = 120 - (2900)(-0.042) = 120 - 121.8 = - 1.8 KJ < 0

6 0

3 years ago

Can sombody pls help me with this​

Can sombody pls help me with this