Mr Allen wanted to fill balloons for a party he rented a helium tank that contained 0.4 cubic meters of helium gas he was considered that the gas would not fill many balloons way was the small of helium gas able to fill so many balloons

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:

the answer is b & c i believe : )

6.4 cm (max) - 25 cm (min)