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g100num [7]
3 years ago
8

What is the wavelength of an X-ray that has a frequency of 7.8 x 1017 Hz

Chemistry
1 answer:
SVEN [57.7K]3 years ago
3 0

Answer:

λ = 0.38 ×10⁻⁹ m

Explanation:

Given data:

Wavelength of xray = ?

Frequency of xray = 7.8 ×10¹⁷ Hz

Solution:

Formula:

Speed of light = wavelength × frequency

speed of light = 3×10⁸ m/s

Now we will put the values in formula.

3×10⁸ m/s = λ × 7.8 ×10¹⁷ Hz

λ = 3×10⁸ m/s / 7.8 ×10¹⁷ Hz

         Hz = s⁻¹

λ = 3×10⁸ m/s / 7.8 ×10¹⁷s⁻¹

λ = 0.38 ×10⁻⁹ m

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The concentration in (M) of bromide ions ina
Anon25 [30]

Answer : The concentration in (M)of bromide ions in a saturated solution of mercury (II) bromide is, 2.7\times 10^{-7}M

Explanation :

The solubility equilibrium reaction will be:

HgBr_2\rightleftharpoons Hg^{2+}+2Br^{-}

Let the molar solubility be 's'.

The expression for solubility constant for this reaction will be,

K_{sp}=[Hg^{2+}][Br^{-}]^2

K_{sp}=(s)\times (2s)^2

K_{sp}=4s^3

Given:

K_{sp} = 8.0\times 10^{-20}

Now put all the given values in the above expression, we get:

K_{sp}=4s^3

8.0\times 10^{-20}=4s^3

s=2.7\times 10^{-7}M

Therefore, the concentration in (M)of bromide ions in a saturated solution of mercury (II) bromide is, 2.7\times 10^{-7}M

6 0
3 years ago
Which step of desalination must be done before water is condensed and collected?
USPshnik [31]

the water is heated until it evaporates

6 0
2 years ago
Describe one way the respiratory and nervous system work together​
DiKsa [7]
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The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.

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7 0
2 years ago
For the reaction Fe3O4(s) + 4H2(g) --&gt; 3Fe(s) + 4H2O(g)
mojhsa [17]

Answer : The value of equilibrium constant for this reaction at 328.0 K is 1.70\times 10^{15}

Explanation :

As we know that,

\Delta G^o=\Delta H^o-T\Delta S^o

where,

\Delta G^o = standard Gibbs free energy  = ?

\Delta H^o = standard enthalpy = 151.2 kJ = 151200 J

\Delta S^o = standard entropy = 169.4 J/K

T = temperature of reaction = 328.0 K

Now put all the given values in the above formula, we get:

\Delta G^o=(151200J)-(328.0K\times 169.4J/K)

\Delta G^o=95636.8J=95.6kJ

The relation between the equilibrium constant and standard Gibbs free energy is:

\Delta G^o=-RT\times \ln k

where,

\Delta G^o = standard Gibbs free energy  = 95636.8 J

R = gas constant  = 8.314 J/K.mol

T = temperature  = 328.0 K

K = equilibrium constant = ?

Now put all the given values in the above formula, we get:

95636.8J=-(8.314J/K.mol)\times (328.0K)\times \ln k

k=1.70\times 10^{15}

Therefore, the value of equilibrium constant for this reaction at 328.0 K is 1.70\times 10^{15}

3 0
3 years ago
What is the partial pressure of argon, par, in the flask? express your answer to three significant figures and include the appro
monitta
Given which are missing in your question:
the flask is filled with 1.45 g of argon at 25 C° 
So according to this formula (Partial pressure):
PV= nRT
first, we need n, and we can get by substitution by:
n =  1.45/mass weight of argon
   = 1.45 / 39.948 = 0.0363 mol of Ar
we have R constant = 0.0821
and T in kelvin = 25 + 273 = 298
and V = 1 L
∴ P * 1 = 0.0363* 0.0821 * 298 = 0.888 atm

3 0
3 years ago
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