$\overline{){\mathbf{\u2206}}{\mathbf{E}}{\mathbf{=}}{\mathbf{q}}{\mathbf{+}}{\mathbf{w}}}$

where w is work

$\overline{){\mathbf{w}}{\mathbf{=}}{\mathbf{-}}{\mathbf{P}}{\mathbf{\u2206}}{\mathbf{V}}}$

A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.10 atm. The expansion does 276 J of work on the surroundings. What is the final volume of the cylinder?

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