Redox, car battery, sales (Redox-42) A car batteries be full loaded and containing 1.5 litres a 30% mixtures of sulphuric acid. '[translation unavailable]' be the concentration only still 20%. How much lead or lead oxide was applied each time? Note: the density the 30% sulphuric acid-solution of which: 1.84 g/cm3. The density is equal to the discharge.

  Exercise: Redox-42    

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A car batteries be full loaded and containing 1.5 litres a 30% mixtures of sulphuric acid. '[translation unavailable]' be the concentration only still 20%. How much lead or lead oxide was applied each time?
Note: the density the 30% sulphuric acid-solution of which: 1.84 g/cm³. The density is equal to the discharge.

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Solution:

1. % refers to mass percentages
2. 1 litres has a mass of 1840 grams. 1.5 litres thus 2760 g
3. In total are 10% implemented (of 30% → 20%), i.e. 276 grams
4. The balanced reaction equation is:
   1·Pb + 1·PbO₂ + 2·H₂SO₄ ⇄ 2·PbSO₄ + 2·H₂O

This leads to the following scenario:

substance	M(g/mol)	m(g)	n(mol)
H2SO4	98	276	2.816
Pb	207.2	291.77	1.408
PbO2	239.2	336.79	1.408

Es have been thus [translation unavailable] 291.77 grams lead and 336.79 grams lead oxide (PbO₂) implemented

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