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CBSE Class 11-science Answered

It was found that 380mL of a gas at 27◦C and 800mm of Hg weighed 0.455g. Find the molecular weight of the gas  
Asked by ramandeep.kaur | 18 Jun, 2018, 05:47: PM
answered-by-expert Expert Answer
G i v e n colon P r e s s u r e space equals space 800 space m m space o f space H g equals 800 over 760 space equals space 1.052 space a t m V o l u m e space equals space 380 space m l space equals space 0.380 space l i t r e T e m p e r a t u r e space equals space 27 to the power of 0 C space equals space 273 space plus space 27 space equals space 300 K N o w comma space U sin g space b y space f o r m u l a comma P V space equals n R T space... space left parenthesis space R space equals space g a s space c o n s tan t space equals space 8.2 space cross times 10 to the power of negative 2 end exponent right parenthesis because space n space equals space fraction numerator P V over denominator R T end fraction space equals space fraction numerator 1.052 space cross times 0.380 over denominator 8.2 space cross times 10 to the power of negative 2 end exponent cross times 300 end fraction space equals space fraction numerator 0.39976 over denominator 24.6 end fraction space equals space 0.0162 N o w comma space g i v e n space m a s s space o f space t h e space g a s space i s space 0.455 therefore space N o. space o f space m o l e s space equals fraction numerator M a s s space over denominator M o l a r space m a s s end fraction space therefore space M o l a r space m a s s space equals fraction numerator M a s s over denominator N o. o f space m o l e s end fraction space equals space fraction numerator 0.455 over denominator 0.0162 end fraction space equals space 28.08 space g divided by m o l e T h e space m o l a r space m a s s space o r space m o l e c u l a r space w e i g h t space o f space t h e space g a s space i s space space 28.08 space g divided by m o l e
Answered by Ramandeep | 18 Jun, 2018, 06:03: PM

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