1 1 The equation for Lavoisier's experiment is as follows: glass vessel + tin + air glass vessel + tin oxide + remaining air Before heating Lavoisier weighed the reactants. To prove the Law of Conservation of Mass, what observation would Lavoisier have made when he weighed the products?​

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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

you did not give any options thus this is the best answer i can give to you with this little information you have given

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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.