Question

class 11 ncert chemistry unit 5 ques. 5.7....i am getting the answer 8.314* 10^minus 2 instead of 8.314* 10^4... can u plz explain why is this so...??

Answer 1

i don't know why u got that answer but i can solve it and u can re check your answer 
Mass of CH 4= 3.2 g moles of CH 4
Moles  of CH4 = 3.2/16 = 0.2

Mass of CO2 = 4.4 g moles of of CO
Moles of CO2 = 4.4/44
Total moles present in mixture = 0.2 +0.1 = 0.3 

Given :
 Volume of ask = 9 dm³ = 9 liter 
Temperature = 273 + 27 = 300K

Now for pressure of mixture
Given formula : 

P x V = nRT
P = (nRT)/V
P = (0.3 x 0.0821 x 300 )/9
P= 0.821 Latm
P= 8.314 x 10↑4  Pa