Final volume = 4.21 + 2.41 = 6.62 L
Ideal gas equation,
PV = nRT
At constant T,
P1V1 = P2V2
P2 (H2) = 5.26 atm x 4.21 L / 6.62 L = 3.345
atm
P2 (Kr) = 1.56 atm x 2.41 L / 6.62 L = 0.568 atm
P (mixture) = 3.345 atm + 0.568 atm = 3.913 atm
Answer: 3.913 atm
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