In: Chemistry
Answer :
(1) : use ideal gas equation
P1 * V1 / T1 = P2 * V2 / T2
Given , P1 = 1520 mmHg , V1 = 5 * 103 ml
T1 = 30°C = 303 K , T2 = 40°C = 313 K ,
V2 = 7 * 103 ml
P2 = (P1 * V1 * T2 ) / ( T1 * V2 )
P2 = ( 1520 * 5 * 103 * 313 ) / ( 303 * 7 * 103 )
= 1121.5 mmHg
Final pressure that balloon exerts = 1121.5 mmHg
(2) : Given, P1 = 750 torr , V1 = 65 ml , T1 = 22°C = 295 K
STP condition ( 1 atm , 0°C )
So, P2 = 1 atm = 760 torr
T2 = 0°C = 273 K
So, using ideal gas equation
V2 = ( P1 * V1 * T2 ) / ( T1 * P1 )
V2 = ( 750 * 65 * 273 ) / ( 295 * 760 ) = 59.36 ml
Volume of this gas sample at STP = 59.36 ml