A mixture contains 220 mmHg of CO, 350 mmHg of Ne and 640 mmHg of He. What is the total pressure of the mixture?

1 a

2 d

3 a

4 c

explanation:

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:

elements make up everything, and they combine to make compounds.

the answer is c