YumYum247
  • YumYum247
help me please!!!!!!!!!!!!!!!!!!!!! OMGGGGGGG!!!! X|
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
YumYum247
  • YumYum247
@Michele_Laino
YumYum247
  • YumYum247
@q12157
anonymous
  • anonymous
Have you learned the equation Q=mcT yet?

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More answers

YumYum247
  • YumYum247
yes yes yes!!! !XD
anonymous
  • anonymous
Do you know what c is?
YumYum247
  • YumYum247
heat capacity
YumYum247
  • YumYum247
sorry...
YumYum247
  • YumYum247
i meant specific heat
anonymous
  • anonymous
so what is the specific heat capacity of water
YumYum247
  • YumYum247
the amount of energy it requires to raise the temperature of a 1Kg substance by 1 degreeeeeeeee
YumYum247
  • YumYum247
4.2X 10^3J/KgC
YumYum247
  • YumYum247
but pleaase answer my question please.........can't i just take 2 Kg of water and turn it into steam or something?!?1/1?!!?!?!?!??!!??!?!?
anonymous
  • anonymous
yesh but you need to know the temperature in which water turns into steam...which is?
YumYum247
  • YumYum247
hunnet
anonymous
  • anonymous
you can probably do the rest i believe
YumYum247
  • YumYum247
ive done the question for 2 KG and not 8Kg.....
YumYum247
  • YumYum247
i just took 2Kg water and turned it into stream...
YumYum247
  • YumYum247
Q = mct Q = 8Kg X 4.2X10^3J/KGC X 100C-25C Q = 2520J
YumYum247
  • YumYum247
i honestly don't know what to do :"(
YumYum247
  • YumYum247
ok thats the nergy required to boil 8Kg of water.... whats next?????
anonymous
  • anonymous
Find energy of the water at 25 degrees then find energy at of water at 100 degrees. You then subtract
YumYum247
  • YumYum247
yes but that would be for 8Kg of water right???????
YumYum247
  • YumYum247
any idea????
YumYum247
  • YumYum247
and since there is a change of state i think we need to add another formula.......Q = ml
anonymous
  • anonymous
4.46*10^6J?
YumYum247
  • YumYum247
what is that????????????/
anonymous
  • anonymous
i cant really think right now, but the answer is prolly something like this: Q = mct Q1=8kg*4.2*10^3*25--->Q2+Q3 where Q2=2*4.2*10^3*100 and Q3=2*2.23*10^6 so therefore energy added=Q2+Q3-Q1 which is equal to Q3 since Q2=Q1 and Q3=4.45*10^6 There is a good chance im wrong but im legit dying i need sleep
anonymous
  • anonymous
and by 4.45 i mean 4.46
YumYum247
  • YumYum247
ok but there is a change of state of matter....Q= ml......what about that, your turning water to stream
anonymous
  • anonymous
Q3 is the change of state
anonymous
  • anonymous
if im not mistaken m=2 l=2.23*10^6 J/kg or something
anonymous
  • anonymous
I dont remember
YumYum247
  • YumYum247
ok hun thanks....i love you,,,,, muuuuuuhhhaaaa, sweet dreams!! :")
anonymous
  • anonymous
yah night lol
anonymous
  • anonymous
sorry if im wrong tho xD
YumYum247
  • YumYum247
i'll figure it out eventually.... LOL
MrNood
  • MrNood
OK - first you need to raise the temperature of the water from 25 C to 100C. You were correct above and your calculation was: Q = 8Kg X 4.2X10^3J/KGC X 100C-25C Q = 2520J BUT now you need to add more energy to convert the water at 100 C to Steam at 100 C for this you need the 'latent heat (or enthalpy) of vapourisation and the equation is Q= mL so there are 2 'lots' of energy required: first 'specific heat' to raise the temp to 100 then 'latent heat' to turn the water into steam at 100 C add them together for the answer
anonymous
  • anonymous
Thanks Mr Nood lol! Turns out i slept 17 consecutive hours... wtf
YumYum247
  • YumYum247
imma give you a medal just for that....LOL
YumYum247
  • YumYum247
i figured out the question......you don't subtract, you divide by 4....since it's a 8:2 ratio. i did it both ways, i'm getting the same answer!!!!!!! XD
YumYum247
  • YumYum247
and yes that's exactly what Mr.Noob said XD....
MrNood
  • MrNood
I have no idea why you seem fixated on 2kg or any 8:2 ratio use the specific heat capacity for 8kg raised 75 K use the latent heat for 8kg from water at 100 C to steam at 100 C add them together

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