Which statement describes the impact of ocean currents on climate?
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ocean currents create changes in the temperaturę of air over land masses.
ocean currents cause the temperature of air over large bodies of water to change.
ocean currents move cold water from the equator to the poles, creating cool weather regions.
ocean currents carry warm water from the poles to the equator to create warm weather regions.

idk what the question is about

that's what i got you can count the number of atoms

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