Answer:
141.53 mL
Step-by-step explanation:
Using P1V1/T2 = P2V2/T2
Where;
P1 = initial pressure
P2 = pressure at STP
T1 = initial temperature
T2 = temperature at STP
V1 = initial volume
V2 = volume at STP
According to this question;
V1 = 225mL, T1 = 70°C + 273 = 343K
P1 = 550mmHg/760mmHg = 0.724atm
At Standard temperature and pressure (STP);
P2 = 1atm
T2 = 25°C + 273 = 298K
V2 = ?
Hence;
P1V1/T2 = P2V2/T2
0.724 × 225/343 = 1 × V2/298
298 × 0.724 × 225 = 343 × 1 × V2
48544.2 = 343V2
V2 = 48544.2/343
V2 = 141.528mL
Hence, the volume at STP is 141.53mL