The electron dot diagram shows the arrangement of dels without identilying the element,
Which element's symbol could replace the question mark in
the diagram?
boron (B)
O neon (Ne)
Orubidium (b)
arsenic (A)
Malk thor and notum.
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Subina
anything
O
O

the product of the pressure and volume is also constant

bcde is the incorrect answer it is a

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