por la combustión de la fosfina se obtiene el pentóxido de difosforo según la siguiente reacción: 2PH3(g) + 4O2(g) P2O5 (s)+ 3H2O(l). Si combustionan 34g de fosfina . ¿Cuántos litros de oxígeno se consumen?

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.

the correct answer to this question is 2

the answer is c.the valence of the atoms combine .