7 mol of a certain monoatomic ideal gas undergoes a temperature increase of 40K at constant pressure. The increase in the internal energy of the gas in this process is:

(Given R = 8.3 JK^-1 mol^-1)

<p><math><mrow><mi>Δ</mi><mi>u</mi><mo>=</mo><mi>n</mi><msub><mrow><mi>C</mi></mrow><mrow><mi>V</mi></mrow></msub><mi>Δ</mi><mi>T</mi></mrow></math></p><p><math><mrow><mo>=</mo><mi>n</mi><mfrac><mrow><mn>3</mn><mi>R</mi></mrow><mrow><mn>2</mn></mrow></mfrac><mi>Δ</mi><mi>T</mi></mrow></math></p><p><math><mrow><mo>=</mo><mn>7</mn><mo>×</mo><mfrac><mrow><mn>3</mn></mrow><mrow><mn>2</mn></mrow></mfrac><mo>×</mo><mn>8</mn><mo>.</mo><mn>3</mn><mo>×</mo><mn>4</mn><mn>0</mn></mrow></math></p><p><math><mrow><mo>=</mo><mn>3</mn><mn>4</mn><mn>8</mn><mn>6</mn><mtext> </mtext><mtext> </mtext><mi>J</mi></mrow></math></p>

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