Compare acidity of methane , ethane and ethyne​ .

methane=ch4

ethane=c2h6

ethyne=c2h2

Explanation:

the difference is that methane and ethane have single bond between carbon atoms (they are alkane) whereas ethyne has triple bond(it is alkyne)

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:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.