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/sci/ - Science & Math

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2400104 No.2400104 [Reply] [Original]

What mass of ice at -10 degrees Celsius must be added to 126 g of steam at 220 degrees Celsius to produce water at 100 degrees Celsius?

>> No.2400110 [DELETED] 
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2400110

>126 g of steam

0/10

>> No.2400116

>>2400110
>Implying steam has no mass

>> No.2400120

>>2400104
Not enough information OP.

>> No.2400121

>>2400116
>implying anyone said anything of the sort.

>> No.2400126

>>2400120
There's enough info, I just don't want to do his homework.

>> No.2400146

q = m cp delta T faggot.

>> No.2400160

>>2400121
>Implying you didn't delete your post

>> No.2400169 [DELETED] 

>>2400160
implying this wasn't my first post in this thread >>2400121

>> No.2400177

>>2400160
>implying this wasn't my first post in this thread >>2400121

>> No.2400180

>>2400126
>There's enough info
No, there isn't. There is only one thermodynamic property listed for the steam. You need two independent, intensive properties to solve this problem.

>> No.2400212

There is enough info, you just need to know mH
BTW, this isn't my homework, this is a review for my exam comming up thursday in which I'm completely fucked for, if you don't want to help, fine by me

>> No.2400232

>>2400177
>Implying it is

>> No.2400234

>>2400212
>There is enough info
No, there isn't. How do you know if that steam is saturated or superheated?

>> No.2400266

When it is not stated, assume atmospheric conditions, e.g. 1 atm of pressure, 25 C ambient temp. Can't go wrong.

>> No.2400278

>>2400266
Bad practice. NASA lost $100M on a bad assumption.

>> No.2400277
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2400277

>>2400232

>> No.2400289

▲Q=mc▲t (accept ▲as delta)-simultaneous eqs?

>> No.2400349

>>2400278
>>2400278
Its regular atmospheric conditions for Christ sake, you're going to be the death of me.

>> No.2400355

>>2400349
You can't assume that, broski. It's bad practice to develop those habits. The question is indeterminate.

>> No.2400378

>>2400355
I'm not assuming brah, it uhh, says here on the sheet.

>> No.2400385

>>2400378
>implying we can all see your sheet.
>I have no face at the future of the world.

>> No.2400392

Don't forget about latent heat of vapourization/fusion kiddies

>> No.2400406

>>2400355
>>2400349
>>2400234
>>2400180
Yeah you guys need to learn to make basic assumptions when you're talking about school problems. Don't make the assumptions when you're out doing design work or something, but unless otherwise stated, a basic problem involving steam can assume 1atm.

>> No.2400435

>>2400406
It's bad practice to assume anything.

>> No.2400439

>>2400435
You can't solve problems without making assumptions. Shit in my undergraduate I was taught to make a specific list of assumptions when solving a problem. The only problems you can solve without making assumptions are elementary textbook problems.

>> No.2400511

Is anyone really going to do this or are you all going to shit on cats and fuck bitchs whilst claiming you can't do it, when I know for a fact you can.

>> No.2400614

>>2400511
Setup two algebraic equations, one for the ice one for the steam
Q1=mass of ice*heat of fusion+mass of ice*Cp*(100C-0C)
Q2=mass of steam*Cp(steam)*(220C-100C)+mass of steam*heat of vaporization

Set Q1=Q2 and solve for mass of ice.

>> No.2400649

>>2400614
Thanks, much appreciated

>> No.2400664

>>2400614
Not trolling here, but what's Cp?

>> No.2400715

C_p is specific heat for constant pressure i.e. the amount of heat per unit mass required to raise the temperature by one degree Celsius.

>> No.2400924

Can anybody do this problem out for me?