Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum
oxide. A mixture of the two reagents is 39% Al by mass.
1. Find the limiting reactant. Show your detailed solution
2. Find the mass of manganese that forms from the
reaction of 250 g of this mixture.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2

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.