In Mg3(PO4)2 there are

In Mg3(PO4)2 there are 13 atoms

Given

Mg3(PO4)2 compound

Required

The composition of the compound

Solution

Molecular formula (MF) is a formula that shows the number of atomic elements that make up a compound.

In the compound Mg3 (PO4) 2, there are 3 types of atoms, namely Mg, P, and O

The number of each of the atoms:

Mg = 3 atoms

P = 2 atoms

O = 8 atoms

Total atoms in the compound = 3 + 2 + 8 = 13 atoms

it's all four options.

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