Question

in a cyclinder CO2 gas is filled with 20°C temp and 720mmhg pressure. when pressure is 770 mmHg find out temp of gas​

Answer 1

Answer:

You use the Ideal Gas Law.

Explanation:

You also need the volume.

Then, you insert the pressure, volume, and temperature into the expression and calculate the number of moles.

The Ideal Gas Law is

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

a

a

p

V

=

n

R

T

a

a

∣

∣

−−−−−−−−−−−−−−−  

 

We can rearrange this formula to get the number of moles,  

n

.

n

=

p

V

R

T

EXAMPLE

A 3.00 L container is filled with neon gas at 770 mmHg and 27 °C. How many moles of neon are present?

Solution

Step 1. List the information given, making conversions as necessary.

p

=

770

mmHg

×

1 atm

760

mmHg

=

1.013 atm

V

=

3.00 L

R

=

0.082 06 L⋅atm⋅K

-1

mol

-1

T

=

(30 + 273.15) K = 303.15 K

Step 2. Calculate the number of moles.

n

=

1.013

atm

×

3.00

L

0.082 06

L⋅atm⋅K

-1

mol

-1

×

300.15

K

=

0.123 mol

There are 0.123 mol of neon in the container.