Calculen la molaridad y la molalidad de una solución que se preparo al disolver 65g de nitrato de cobre (II), en un volumen final de 250 ml .

the answer is b & c i believe : )

if you mean hydrogen and oxygen then water is the product

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.