1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dsp73
2 years ago
14

An x-ray has a wavelength

Chemistry
1 answer:
goldfiish [28.3K]1 year ago
5 0

Answer:

C

Explanation:

For electromagnetic waves frequency X wavelength = speed of light

                                                f * 2.2 x 10^-11  = 3 x 10^8  m/s

                                         f = 3 x 10^8 / 2.2 x 10^-11

                                            = 1.36 x 10 ^19

                                             = 1.4 x 10^19   with two significant digits

You might be interested in
A reaction A(aq)+B(aq)↽−−⇀C(aq) has a standard free‑energy change of −4.20 kJ/mol at 25 °C. What are the concentrations of A, B,
Dafna1 [17]

Answer : The concentration of A,B\text{ and }C at equilibrium are 0.132 M, 0.232 M  and 0.168 M  respectively.

Explanation :

The given chemical reaction is,

A(aq)+B(aq)\rightleftharpoons C(aq)

First we have to calculate the equilibrium constant for the reaction.

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

\Delta G^o=-RT \ln k

where,

\Delta G^o = standard free‑energy change = -4.20 kJ/mole

R = universal gas constant = 8.314 J/mole.K

k = equilibrium constant = ?

T = temperature = 25^oC=273+25=298K

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

-4.20kJ/mole=-(8.314J/mole.K)\times (298K) \ln k

k=5.45

Now we have to calculate the concentrations of A, B, and C at equilibrium.

The given equilibrium reaction is,

                          A(aq)+B(aq)\rightleftharpoons C(aq)

Initially               0.30      0.40         0  

At equilibrium  (0.30-x) (0.40-x)     x

The expression of equilibrium constant will be,

k=\frac{[C]}{[A][B]}

5.45=\frac{x}{(0.30-x)\times (0.40-x)}

By solving the term x, we get

x=0.168\text{ and }0.716

From the values of 'x' we conclude that, x = 0.716 can not more than initial concentration. So, the value of 'x' which is equal to 0.716 is not consider.

The value of x will be, 0.168 M

The concentration of A at equilibrium = (0.30-x) = 0.30 - 0.168 = 0.132 M

The concentration of B at equilibrium = (0.40-x) = 0.40 - 0.168 = 0.232 M

The concentration of C at equilibrium = x = 0.168 M

3 0
3 years ago
According to the information above what is the standard enthalpy of formation for nh3
olga2289 [7]
Although the data is not stated, the standard enthalpy of formation of ammonia is -46 kJ/mol.

The standard enthalpy of formation of a substance is the change in enthalpy that occurs when one mole of that substance is produced from its elements in their standard states. The fact that the standard enthalpy of formation for ammonia is negative indicates that the formation of ammonia is an exothermic, or energy releasing, reaction.
4 0
3 years ago
C3Hs + O2 = Co2 +H20​
telo118 [61]

Answer:

algabra

Explanation:

air

8 0
3 years ago
Nitroglycerin is a dangerous powerful explosive that violently decomposes when it is shaken or dropped. The Swedish chemist Alfr
ELEN [110]

Answer:

4 C3H5N3O9 ------> 6N2 + O2 + 10H2O + 12CO2

Explanation:

Nitroglycerin has a chemical formula C3H5N3O9. The balanced chemical equation is as follows:

4 C3H5N3O9 ------> 6N2 + O2 + 10H2O + 12CO2

We suppose that in a reaction, 44g of carbon dioxide is produced. The mass of nitroglycerin that must have reacted will be calculated as under:

Molecular mass of Nitroglycerin = 227g/mol

Molecular mass of Carbon dioxide = 44g/mol

No. of moles of carbon dioxide produced = 44/44 = 1 mole produced.

Now, from balanced chemical equation, we can see that

12 moles of carbon dioxide are produced by = 4 moles of nitroglycerin.

1 mole of carbon dioxide is produced by = 4/12 = 1/3 moles of nitroglycerin.

Mass of nitroglycerin which produced 1 mole of carbon dioxide =  1/3 x 227 = 75.666 grams.

6 0
3 years ago
PLEASE HELPPP!!!!!!!!!!!!!!!!!!!!
riadik2000 [5.3K]
Similarities. very useful
differences. coal is a pullutant. while womd is not. i guess
6 0
3 years ago
Read 2 more answers
Other questions:
  • Calculate the pH at the equivalence point for the titration of 0.190 M 0.190 M methylamine ( CH 3 NH 2 ) (CH3NH2) with 0.190 M H
    6·1 answer
  • When we reverse a chemical equation,we multiply it's delta H value by
    14·1 answer
  • Which of these is a pure substance<br> A.Diamond.<br> B.Salt<br> C.Ocean Water
    15·2 answers
  • a fictitious element X is composed of 15.0% of the isotope X-51, 15.0% of the isotope X-52, and 70.0% of the isotope X-53. Estim
    6·1 answer
  • A globe is placed on your desk and you are asked to identify its physical properties. How would you describe the globe?
    10·1 answer
  • The complement protein cascade is the same for the classical pathway, alternative pathway, and lectin pathway after the point in
    15·1 answer
  • For a reaction that follows the general rate law, Rate = k[A][B]2, what will happen to the rate of reaction if the concentration
    8·1 answer
  • Why aren’t the same natural resources found all over the world?
    15·2 answers
  • Which best describes the difference between Mitosis and Meiosis?
    9·1 answer
  • Multiple Select Question
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!