The lead-acid storage battery is the oldest rechargeable battery in existence. I

Question

The lead-acid storage battery is the oldest rechargeable battery in existence. It was invented in 1859 by French physician Gaston Plante and still retains application today, more than 150 years later. There are two reactions that take place during discharge of the lead-acid storage battery. In one step, sulfuric acid decomposes to form sulfur trioxide and water: alo In another step, lead, lead(IV) oxide, and sulfur trioxide react to form lead(II) sulfate: Ar Pb(s) + PbO2(s) + 2SO3(g) 2 PbSO4(s) H=-775. kJ Calculate the net change in enthalpy for the formation of one mole of lead sulfate from lead lead IV oxide and sulf ric acid for Round your answer to the nearest kJ these reactions. kJ

Explanation / Answer

The second reaction produces two moles of products, so we have to divide this by 2 to get one mole of product.

So,

Enthalpy change for first reaction = 113 kJ

Enthalpy change for second reaction = -775/2 = -387.5 kJ

So,

Net enthalpy change = 113-387.5 = -274.5 kJ

Hope this helps !

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