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
SashulF [63]
3 years ago
12

1. An electric power plant uses energy from burning coal to generate steam at 450 °C. The plant is cooled by 20 °C water

Chemistry
1 answer:
kap26 [50]3 years ago
6 0

Answer:

Explanation:

Efficiency of the electric power plant is e=1-\frac{T_{2}}{T_{1}}

Here Temperature of hot source T_{1} = 450^{o}C=450+273=723 K

and Temperature of sink T_{1} = 20^{o}C=20+273=293 K

Hence the efficiency is  e=1-\frac{293}{723}=0.5947=59.47%

Now another formula for thermal efficiency Is

e_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}

Here QI is the of heat taken from source 100 MJ ; Q2 of heat transferred to the sink (river) to be found

W is the of work done and W = QI -Q2

Hence Frome_{therm}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{W}{Q_{1}}

W=e(Q_{1})=(0.5947)(100)=59.47MJ

Hence the of heat transferred to the river Is Q_{2} -W = (100 -59.47=40.53

You might be interested in
I need help with my work
elena-14-01-66 [18.8K]

Answer:

2 the mass is greater than 10.0gram

Explanation:

2 the mass is greater than 10.0gram

8 0
2 years ago
How many moles of Oxygen atoms are in a sample of 3.98 x 10^23 atoms?
Tatiana [17]
1mol\ \ \ \ \rightarrow \ \ \ 6,02*10^{23}\\
x \ \ \ \ \ \ \ \ \ \rightarrow \ \ \ 3,98*10^{23}\\\\
x=\frac{3,98*10^{23}*1mol}{6,02*10^{23}}\approx0,66mol
8 0
3 years ago
Read 2 more answers
In preparation for a blizzard, a city dispatches a crew to spread salt on the street surface of the bridges around town. The sal
timofeeve [1]
Solid to liquid because it wil defrost
4 0
3 years ago
When is the potential energy between two atoms at zero?
ExtremeBDS [4]

Answer:

When two atoms are very far apart, the potential energy approaches zero.

8 0
3 years ago
What is the mole ratio between oxygen and carbon dioxide?<br><br> C25H52 + 38 O2 → 25 CO2 + 26 H2O
user100 [1]

Answer:

38 : 25

Explanation:

First thing's first, we have to confirm if the reaction is indeed balanced.

The equation of the reaction is given as;

C25H52 + 38 O2 → 25 CO2 + 26 H2O

From the reaction, 38 moles of O2 produces 25 moles of CO2

The ratio is given as;

38 : 25

4 0
3 years ago
Other questions:
  • Recycled r134a refrigerant cannot exceed what levels of contaminants
    15·1 answer
  • How many neutrons are in Cesium-130 (130/50 Cs)
    6·1 answer
  • Cosmone has the molecular formula C15H26O. Calculate the number of moles of carbon in a 8.35-mol sample of cosmone. Calculate th
    15·1 answer
  • Hydroxyapatite, Ca 10 ( PO 4 ) 6 ( OH ) 2 Ca10(PO4)6(OH)2 , has a solubility constant of Ksp = 2.34 × 10 − 59 2.34×10−59 , and d
    15·1 answer
  • In the molecule, HCl, the __atom pulls more on the bonded pair of electrons, creating a dipole
    10·2 answers
  • Is hot water added to a bath conduction, convection, or radiation
    5·1 answer
  • Enumere por lo menos 5 objetos que antiguamente se hacían con otro material y en la actualidad se hacen con un polímero. Identif
    7·1 answer
  • You are given and irregular shaped lump of a material and determine that it has a mass of 36.0000 g. When placed in a graduated
    15·1 answer
  • Which of the following is NOT a plate motion that will occur at a plate boundary?
    8·2 answers
  • Describe two ways that can be used to identify which layer is organic and which layer is the aqueous layer in a liquid-liquid ex
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!