An elementary school science fair volcano is often made by mixing vinegar and ba

Question

An elementary school science fair volcano is often made by mixing vinegar and baking soda with the reaction

CH3COOH (aq) + NaHCO3(s) CH3COONa (aq) + CO2(g) + H2O(g)

Which sentence below best describes this reaction?

A) Work, a positive quantity, is done by the surroundings on the system.

B) Work, a positive quantity, is done by the system on the surroundings.

C) Work, a negative quantity, is done by the surroundings on the system

.D) Work, a negative quantity, is done by the system on the surroundings.

Explanation / Answer

since there is production of gas, the system will expand

then

W = -P*dV = -P(Vf-Vu)

Work must be negative; since the system does work to the surroundings

therefore the system loses energy

choose D

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