How many different elements make up beryllium sulfite

There are 3 elements that make up Beryllium Sulfite (BeSO3). These elements are Beryllium, Sulfur, and Oxygen. This is because the compound Sulfite (SO3) is composed of a sulfite ion, which is created by the merging of oxygen and sulfur. 

Explanation:

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