PLEASE NO LINKS - I will report you Need help please:

Dalton’s Law PT = P1 + P2 + P3
Jenny has three containers which each has a volume of 2 liters. The first container has a pressure of 1.2 atms, the second container has a pressure of 1.7 atms, and the third container has an unknown pressure. She puts the three gases into a two-liter container and records the total pressure to be 3.5 atms. What was the pressure of the third container?

b i think it’s a water wheel turning in a stream

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

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

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.