Question

A sample of ethane (C2H6) gas has the same mass as 1.5 x 102° molecules of methane (CH). How many C2H6 molecules does the sample of gas contain?​

Answer 1

Answer:

Mass of 1 molecule of CH4=16/NAg

Mass of 1.5×10²⁰molecules of methane = 1.5×10²⁰×16/NA g

Mass of x molecules of C2H6 is =1.5×10²⁰×16/NA g

We know that mass of 1 molecule of C2H6=30/NA g

∴ Number of molecules of ethane (x) = 1.5×10²⁰×16/NA × NA/ 30 = 0.8 × 10²⁰

HOPE ITS HELPFUL