Agas occupies 16.3 l at stp. what volume will it occupy at 735 torr and 57°c?

Use the equation PV=nRT to find no. of moles (n) 
For this;
At STP
Pressure= P= 1 atm
Temperature=T = 273.16 K
Volume= V= 16.3 L = 16.3 dm³
R = 0.0821 dm³ atm K⁻¹ mol⁻¹
Now,
                             PV= nRT
                            (1)(16.3)=n(0.0821)(273.16)
                                  n = 0.727 mol

Now, again using the same equation for
Pressure=P=  735 torr
Temperature=T= 57°C 
T= 57+273 =330 K
n= 0.727 mol (form previous calculation)
R= 62.4 dm³ torr K⁻¹ mol⁻¹
Now,
                                    PV= nRT
                                   (735)V= (0.727)(62.4)(330)
                                           V= 20.37 dm³

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.