The health of fish depends on the amount of oxygen dissolved in the water. a dissolved oxygen concentration between 6 parts per million and 8 parts per million is best for fish health. a dissolved oxygen concentration greater than 1 part per million is necessary for fish survival. a student’s fish tank contains fish, green plants, and 3800 grams of fish-tank water with 2.7 × 10^-2 gram of dissolved oxygen.

Write a statement using this information that tells why the dissolved oxygen concentration in the water is or is not healthy for fish.

hurricanes form in warm water

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the answer is true. hope it .

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