A group of plant cells are placed in water an are kept in the dark. The cells eventually all die. Which option most accurately Describes why the cells died?

1. The cells did not have access to sunlight. The cells died when existing reserves of sunlight were used up.

2. The cells did not have access to oxygen to create carbon dioxide. it is carbon dioxide that fuels the cellular activities that maintain life.

3. The cells did not have access to carbon dioxide. The cells died when existing reserves of carbon dioxide were used up

4. The cells did not have access to sunlight to create more sugar. it is sugar that fuels the cellular activities that maintain life.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

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