Plants and animals differ in how they obtain food and how they maintain structure. Part 1. From the image, identify the NUMBER that represents the CHLOROPLAST and also HOW it helps a plant obtain food. Part 2. From the image, identify the NUMBER that represents the CENTRAL VACUOLE and also HOW it helps a plant maintain its structure.

that tool would be a compass

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