Modern Marvels: Acid 1. What types of explosives are made from nitric acid?
2. What types of safety procedures need to be followed when handling and transporting nitric acid?
waar Safty glasses, A face shield, and gloves
3. What other types of products are made from nitric acid?
4. Why is it that a country's productivity can be measured in terms of sulfuric acid production?
5. Why should you never add water to acid?
6. Briefly explain how sulfuric acid is produced commercially.
7. In gelatin production, what is the purpose of the, "Stick test?"

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