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To solve this problem using the combined gas law, we can set up the equation as follows:
\(P_1V_1/T_1 = P_2V_2/T_2\)
Plugging in the values:
\(1.15 atm * 2.55 L / (25 + 273) K = P_2 * 3.15 L / (45 + 273) K\)
\(0.404 atm = P_2 * 3.15 L / 318 K\)
\(P_2 = 0.404 atm * 318 K / 3.15 L\)
\(P_2 = 40.82 atm\)
So, the new pressure in the balloon is 40.82 atm.