How many moles of NO2 are needed to increase the temperature of a 333 gram block of iron from 220C to 13000C? (specific heat of iron is 0.49 J/g0C) 3NO2 + H2O --> 2HNO3 + NO ∆H = - 138 kJ /mol

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.

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