Gas is leaking from the compressed carbon dioxide cylinder due to valve malfunction. Tank capacity V = 10 liters.

Gas is leaking from the compressed carbon dioxide cylinder due to valve malfunction. Tank capacity V = 10 liters. At a temperature of T1 = 263 K, the manometer showed a pressure of p1 = 9.3 atm, and after a while at a temperature of T2 = 295 K, the manometer showed a pressure of p2 = 9.4 atm. What is the mass m of the gas that has flowed out of the cylinder during this time?

Decision:
Let’s make a formula
p1V = m1 / M * RT1;
m1 = p1VM / RT1;
m2 = p2VM / RT1
m1-m2 = MV / R * (p1 / T1-p2 / T2)
m1-m2 = 44 * 0.01 / 8.31 * (9.3 * 10 ^ 5 / 253-9.4 * 10 ^ 5/295)
m1-m2 = ~ 18.5 g