Which of the following statements best describes the difference between amylose and amylopectin? Amylose is present in starches and amylopectin is present in fiber. Amylose is a complex carbohydrate and amylopectin is a simple sugar. Amylose is composed of glucose and amylopectin is composed of fructose molecules. The components of amylose are bonded in a linear structure and the components of amylopectin are bonded in a branched structure.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

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