“A chemist was creating iodine chloride according to the following reaction: 2I2 + KIO3 + 6HCL —> 5ICl + KCl + 3H2O
What volume of 0.5 M hydrochloric acid would need to be addd to make 24.9g of ICl assuming the other reactants are in excess?”

How do i solve this i am completely lost

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

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

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.