Lanthanides and actinides are what kind of metals? inner-transition alkaline earth alkali transition is alkaline earth right

Lanthanides  and actinides are  inner  transition

   Explanation

Lanthanides and actinides  are  known as  inner  transition  element  because they are located   at the bottom of periodic  table.

Lanthanide elements are element  which atomic number ranges between 58-71 and they fill  their  4F sub level  progressively.

Actinides elements are  elements which atomic number  ranges  between 89 -103  and  they fill their 5f  sub level  progressively.

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answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol