Question

If a gas sample has a pressure of 30.7 kPa at 0 degrees celcius, by how much does the teperature have to decrease to lower the pressure to 28.4 kPa?

Answer 1

Answer:

Explanation:

In this question I assume that the volume is unchanged and therefore, we can use the following law:

P

T

=

k

Then,  

P

1

T

1

=

P

2

T

2

⇒

T

2

=

T

1

P

1

×

P

2

⇒

P

2

=

273.15 K

30.7

kPa

×

28.4

kPa

=

252.69 K

Therefore, the temperature should be lowered to:  

252.69

−

273.15

=

−

20.464

∘

C

⇒

T

2

=

−

20.5

∘

C

to 3 sig figs.

Explanation:

Answer 2

Answer:

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j

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