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VARVARA [1.3K]
3 years ago
8

The red line of the hydrogen emission spectrum has a wavelength of 656.1 nm. Calculate the energy of one photon

Chemistry
1 answer:
Effectus [21]3 years ago
4 0

The formula we can use here is the Plancks equation:

E = h c / ʎ

where h is Plancks constant = 6.626 × 10-34 m2 kg / s, c is speed of light = 3 x 10^8 m/s and ʎ is wavelength = 656.1 x 10^-9 m

 

Therefore E is:

E = (6.626 × 10-34 m2 kg / s) * (3 x 10^8 m/s) / 656.1 x 10^-9 m

<span>E = 3.03 x 10^-19 J</span>

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2 years ago
a gas sample occupies a volume of 140 mL at a temperature of 296 K and a pressure of 98.2kPa. how many moles of gas are there? s
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Answer:

0.00559 mol

Explanation:

The following data were obtained from the question:

V = 140mL = 0.14L

T = 296K

P = 98.2kPa = 98200Pa

Recall: 101325Pa = 1atm

98200Pa = 98200/101325 = 0.97atm

R = 0.082atm.L/Kmol

n =?

The number of mole (n) can be obtained as follows:

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n = PV /RT

n = (0.97x0.14)/(0.082x296)

n = 0.00559 mol

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4 0
3 years ago
Pipettes are used when measuring the volumes of liquids with high degree of precision. The following volumes were obtained durin
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Answer:

0.075

Explanation:

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∑d^2= 0.0144 + 0.0064 + 0.0016 + 0.0001

∑d^2= 0.0225

Variance = ∑d^2/N = 0.0225/4 = 0.005625

Standard deviation= √0.005625

Standard deviation= 0.075

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