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
kherson [118]
3 years ago
5

g A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. If the

radiation wavelength is 12.5 cm, how many photons of this radiation would be required to heat a container with 0.250 L of water from a temperature of 20.0oC to a temperature of 99oC
Chemistry
1 answer:
Sliva [168]3 years ago
5 0

Answer:

The total photons required = 5.19 × 10²⁸ photons

Explanation:

Given that:

the radiation wavelength λ= 12.5 cm = 0.125 m

Volume of the container = 0.250 L = 250 mL

The density of water = 1 g/mL

Density = mass /volume

Mass =  Volume ×  Density

Thus; the mass of the water =  250 mL ×  1 g/mL

the mass of the water = 250 g

the specific heat of water s = 4.18 J/g° C

the initial temperature T_1 = 20.0° C

the final temperature T_2 = 99° C

Change in temperature \Delta T = (99-20)° C = 79 ° C

The heat q absorbed during the process = ms \Delta T

The heat q absorbed during the process = 250 g × 4.18 J/g° C × 79° C

The heat q absorbed during the process = 82555 J

The energy of a photon can be represented by the equation :

= hc/λ

where;

h = planck's constant = 6.626 \times 10^{-34} \ J.s

c = velocity of light = 3.0 \times 10^8 \ m/s

=  \dfrac{6.626 \times 10^{-34} \times 3.0 \times 10^8}{0.125}

= 1.59024 \times 10^{-24} J

The total photons required = Total heat energy/ Energy of a photon

The total photons required = \dfrac{82555 J}{1.59024 \times 10^{-24}J}

The total photons required = 5.19 × 10²⁸ photons

You might be interested in
FAST I NEED THIS TO STUDY MY QUIZ IS TOMORROW!!!!
Elena L [17]

Answer:

The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.

Explanation:

make me as brain liest

4 0
3 years ago
Read 2 more answers
Can someone please describe these characteristics from the periodic table? Were looking at the elements F, Cl, S, and NE
Vlad [161]

Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.

7 0
3 years ago
Which of the following is NOT an example of a molecule <br> A: H2O2<br> B:NCI3<br> C:F<br> D:O3
timama [110]

C. F because it's an atom not a molecule

6 0
3 years ago
Read 2 more answers
ANSWER FAST PLZ 25 POINTS!!!!!!!!!!!!!!!
Scilla [17]

Answer:

i think the answer is C)

Explanation:

8 0
3 years ago
A 4.86-gram sample of calcium reacted completely with oxygen to form 6.80 grams of calcium oxide. This reaction is represented b
sesenic [268]
The number of mole of Ca reacted is:
4.86 g Ca/ (40.08 g/mol Ca)= 0.121 mol Ca

Because Ca reacted completely with oxygen and there is 2 mol Ca, there is 1 mol O2 reacted.

Total mass of oxygen that reacted is:
0.121 mol Ca* (1mol O2/ 2 mol Ca)* (32 g O2/ 1 mol O2)= 1.94 g O2 reacted.

Hope this would help~
8 0
3 years ago
Other questions:
  • When Dimitri Mendelev first developed the periodic table, one of the most important features that he introduced was starting a n
    8·2 answers
  • Why does sulfur have more than 8 electrons in its valence?
    11·1 answer
  • A tree was chopped down and cut up in a local forest. The tree changed in shape.
    6·2 answers
  • Ide ores, such es ? ​
    9·1 answer
  • Look at the image above. Which statement below is NOT accurate?
    9·2 answers
  • What is the weather in a high pressure area usually like?In a low?
    14·2 answers
  • Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of potassium hydroxide and nickel
    7·1 answer
  • Calculate the value of K p for the equation C ( s ) + CO 2 ( g ) − ⇀ ↽ − 2 CO ( g ) K p = ? given that at a certain temperature
    9·1 answer
  • Pl help it’s for homwork
    14·1 answer
  • An increase in blood CO2 or a decrease in blood ph will lead to which change in respiration?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!