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### Topic: Homework - need help  (Read 965 times)

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#### jeto2m

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• Mole Snacks: +0/-0 ##### Homework - need help
« on: November 28, 2021, 11:40:07 AM »
Hello, and I apologise in advance, but I don´t really like chemistry, however it´s a mandatory subject of mine, and I can´t solve two problems our teacher has given us. If there´s someone that could help me, I would be really grateful.
1. I am supposed to find out, how much does 4,48 l of oxygen weight while in normal conditions (whatever that means), and how much does it weight while it has 60 degrees Celsius.
2. What volume (V) of vapor (with the temperature of 95 degree Celsius and pressure of 101000 Pa) will be created by reaction of 1g oxygen and 1g of hydrogen.
I know, that this qustion is probably very primitive, but for me its beyond my abilities. I would like to thank in advance to anyone responding. Last but not least, sorry for my bad english or any mispronunciations.
I´ve managed to come up with something for the first problem, however the second I don´t understand at all.
Here´s my work:
1. V(O2) = 4,48 l
T1 = 273,15 K
P1 = 101 325
m1 = ?
T2(O2) = 60 stupňov
m2(O2) = ?
1 mol plynu = Vm =22,4 l
1 mol O2 = 22,4 l
1 mol .....22,4 l
x mol ....4,48 l
x = 0,2 mol
Rm  = 8,314472 J · K-1 · mol-1
32 g/mol
(P.V.M)/(R.T)=m
m1 = 6396 g = 6,4 kg

T2 =  333,15
P2xV2 = 1661,85612
53 169,3958/2769,96635 = 19,20
m2 = 19,20 g

#### Orcio_87 ##### Re: Homework - need help
« Reply #1 on: November 28, 2021, 11:51:34 AM »
Quote
1. I am supposed to find out, how much does 4,48 l of oxygen weight while in normal conditions (whatever that means), and how much does it weight while it has 60 degrees Celsius.
Normal conditions: 298.15 K (25°C, 77°F) and 1 bar (14.5038 psi, 100 kPa).

Then you need to use pV = nRT equation.

#### jeto2m

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• Mole Snacks: +0/-0 ##### Re: Homework - need help
« Reply #2 on: December 01, 2021, 02:07:58 AM »
Thank you so much.