Question

How many moles of air are there in a 0.125 L Erlenmeyer flask if the pressure is 0.985 atm and the temperature is 20.0 oC?

Use ideal gas law and show work please. Thank you

Answer 1

The answer for the question is answered below.

• 0.05 moles of air is present i the Erlenmeyer flask

Step-by-step explanation:

Given:

volume (v) =0.125 L

Pressure (P) =0.985 atm

temperature (t) =20°C =20 + 273 =293 K

To solve:

no of moles (n)

We know;

According to the Avagadros law;

P × V = n × R × T

0.985 × 0.125 = n × 0.0821 × 293

0.123125= n × 24.0553

n =
`(0.123125)/(24.005)`

n = 0.05 moles

0.05 moles of air is present i the Erlenmeyer flask