What is shown by the structural formula of a molecule or polyatomic ion? a. the arrangement of bonded atoms c. the number of metallic bonds b. the number of ionic bonds d. the shapes of molecular orbitals?

A) The arrangement of bonded atoms.

B) Number of Ionic bonds.

Explanation

The structural formula shows the bonding and general layout of the molecule.

Several molecules can have the same molecular formular especially in the branch of chemistry.

However each compound would always have a distinct way of bonding. By drawing out the structural formular of a molecule, we are pretty much just showing the arrangement of the bonded atoms. That is the primary detail in which a structural formular reveals.

Metallic bonds are generally bonds between metals and that can be obtained by checking if the compound has a metal.

Ionic bonds are bonds that result from the transfer of electrons between a metal and a non metal. By looking at the way the atoms are bonded, we can tell if that bond is an ionic or covalent. This is a secondary information revealed by the structural formula.

Shapes of Molecular orbitals are given by the molecular orbital diagrams and not the structural formular.

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