Which of these would support the idea that mass is conserved in a reaction that produces a gas as a product? Group of answer choices

Subtracting the mass of the gas from the mass of the solid and liquid products.

Mixing the reactants and measuring their total mass.

Trapping the gas and measuring its mass.

Heating the reactants to ensure the reaction occurs in a gaseous state.

h let me think

let that person have a turn to speak : )

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.