Answer:
T2= 7.3°C
Step-by-step explanation:
To solve this problem we will use Charles law equation i.e, 
V1/T1 = V2/T2 
Given data 
V1 = 269.7 L 
T1 = 6.12 °C 
V2= 320.4 L 
T2=? 
Solution:
Now we will put the values in equation 
269.7 L / 6.12°C = 320.4 L / T2 
T2= 320.4 L × 6.12°C/ 269.7 L 
T2= 1960.85 °C. L /269.7 L
T2= 7.3°C