Question

1. A 500 mL sample of oxygen gas at 87.0°C and 500mmHg pressue is changed to new conditions at 447°C and 600 mmHg. What is the new volume?

2. A sample of helium gas has a volume of 100 mL at 27.0°C. If the pressure remains constant, what is the new volume when the temperature is raised to 127°C?

3. The temperature of a gas in a rigid container is increased from 25.0°C to 50.0°C. If the initial pressure is 101.3 kPa, what is the final pressure in kPa?

Answer 1

@Abhisar Think you can handle these? ;) :P

Answer 2

Hello @KissesFromKristine !

u can use this formula for finding the new formula
\[\frac{ P1V1 }{ T1 } = \frac{ P2V2 }{ T2 }\]

Answer 3

\[ \frac{ V1 }{ V2 } = \frac{ T1 }{ T2 }\] for finding the new volume when pressure is constant

Answer 4

3)202.6?

Answer 5

\[\frac{ P1 }{ P2 } = \frac{ T1 }{ T2 }\] for the third one

Answer 6

I got 202.2, Eric. That correct @Abhisar ?

Answer 7

Yes its correct answer for the third one

Answer 8

Hav u figured out the rest two ?
@KissesFromKristine

Answer 9

Yay! Good job, @eric_d. We got it right!

Answer 10

@Abhisar, no I haven't yet. :(

Answer 11

why ?
i gave u the formulas...just put the values and find out

Answer 12

u there ??
@KissesFromKristine

Answer 13

2) 470.37 ?

Answer 14

Yeah, sorry. I'm still kind of struggling with aftermath of my sickness so I was taking some more medicine. I'll try them right now.

Answer 15

okay..thats good :)

Answer 16

Try them first urself

Answer 17

okay..answer for the 3rd one will be 2140 ml

Answer 18

for number 3? or the one we haven't done yet?

Answer 19

sorry i meant number 1

Answer 20

for Q.1 Ans=2140
Q2. Ans = 470
Q3. Ans= 202.2

Answer 21

I agree with you on q2 & q3 but I don't know how you got 2140 for q1..

Answer 22

okay..what are u getting for question no 1?

Answer 23

Is it 1200 mL?

Answer 24

how are u getting this ?

Answer 25

are u using the formula i said ?

Answer 26

I don't really understand the formula you said but this question on my sheet is multiple choice (not all of them are) and 2140 is not one of the answers.

The possibilities are:
A. 208 mL
B. 300 mL
C. 470 mL
D. 833 mL
E. 1.2 x 10^3 mL

Answer 27

@ParthKohli

Answer 28

Who is that?

Answer 29

@Somy

Answer 30

The first one @Somy

Answer 31

which q? @Abhisar

Answer 32

@Somy we're trying to figure out question 1

Answer 33

hmmm let me check out

Answer 34

ohkay

Answer 35

its D

Answer 36

try converting everything to standard units

Answer 37

Ohh, i think I see what I did wrong. Hmm.. Thanks for the help @Somy & @Abhisar. I'm gonna post/try these last few questions then try to finally get some sleep.

Answer 38

convert mL to dm3
convert mmHg to Pa
and convert Celsius to Kelvin by adding 273 to the Celsius
then put those values into the formula @Abhisar gave you :)

Answer 39

and it will give me the answer ?
@Somy

Answer 40

yes :)

Answer 41

1200

Answer 42

How @eric_d ?

Answer 43

It will be D as @Somy said....we just need to convert temperature from celsius into kelvin

Answer 44

we can keep the rest as they are given...just celsius needs to be converted into kelvin

Answer 45

D is what I got when I used Somy's method also. :)

Answer 46

always when solving such questions make sure you use SI units to be on the safest side
only then you can convert the unit of the result to your needed unit
like here if u use dm3 in the formula your resulting volume will be in dm3
but u need cm3 so just multiply by 1000 and you'll get the answer :)

Answer 47

u r ryt @Somy but we can avoid this conversion untill we r just comparing things and not finding absolute results. like in this question we were just comparing two equations. But we need to convert celsius into kelvin because 273.15 needs to be added and not multiplied both sides

Answer 48

yes thats also right :)

Answer 49

so in this question we will get the same results if we just convert temp into kelvin and keep the rest as they are

Answer 50

Btw thankyou so much for bothering and clearing the doubt @Somy

Answer 51

no problem :D @Abhisar