A is the best choice!!!!!!!
Answer:
Explanation:
The law of gravitation
Universal gravitational constant [S.I. units]
Mass of Earth [S.I. units]
Mass of a man in a spacecraft [S.I. units]
Earth radius [km]
Distance between man and the earth's surface
ESULT
Answer:
3moles
Explanation:
Given that Volume of the vessel (V)=8L
Pressure of the vessel (P)=9 atm
Temperature of the vessel (T)=20°C=293K (∵K=273+°C )
Now we know that every ideal gas follows
PV=nRT
We know that R=0.082057
Now
n=3moles