I believe this would be an exothermic reaction, As time increases, the temperature goes up meaning the heat from the system is going into the surroundings. Which indicates an exothermic reaction.
Answer:
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At STP, you can use molar volume to solve this problem. molar mass at stp-->
1 mol = 22.4 Liters
2.06 moles (22.4 Liters/ 1 mole) = 46.1 Liters