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We will use that formula and see. Celsius converted to Kelvin.

20o C = 293.15 Kelvin

40o C = 313.15 Kelvin

KEavg = 3/2RT

KE = 3/2(8.315 J/mol*K)(293.15 K)

= 3656 Joules

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The average kinetic energy increased about 8% in value.

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