D IS A SOLUTION CONTAINING 4.9G/DM³ OF H²SO⁴. E CONTAINS IMPURE SAMPLE OF KOH PER DM³ OF SOLUTION. THE VOLUME OF D IS 25CM³ WHILE THAT OF E IS 24.50CM³ 1. Write a balance chemical equation of reaction
2. Calculate the
i. Concentration of solution D in mol/dm³
ii. Concentration of solution E in mol/dm³
iii. Mass of KOH in 1.00dm³ of solution E
{H=1, O=16, S=32, K=39}

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

it's c (engineer's do their work with mechanical stuff not on any living being)