Question

Find the number of CO2 molecules present in 20l of CO2 at 0°C and 772mm of Hg.
I wiLL mark you as brainliest and give 50 points.​

Answer 1

Answer:

18

At STP, 22.4 liters of a gas forms one mole that is 6.023×10

23

molecules.

Volume of CO

2

in 1 litre of air =

100

0.03

×1 L

∴ No. of molecules of CO

2

=

22.4

6.023×10

23

×

100

0.03

=8.066×10

18

Explanation:

I guess it's this

Answer 2

• R=8.314J/molK
• P=772mmHg
• T=0°C=273K
• V=20L

$\\ \sf\longmapsto PV=nRT$

$\\ \sf\longmapsto n=\dfrac{PV}{RT}$

$\\ \sf\longmapsto n=\dfrac{772(20)}{8.314(273)}$

$\\ \sf\longmapsto n=\dfrac{15440}{2269.722}$

$\\ \sf\longmapsto n=6.8mol$