In the Atlantic Ocean, salinity is higher at mid-latitudes than at the Equator because: Select one:
O a. evaporation occurs more rapidly at mid-latitudes.
O b. evaporation at the Equator is balanced by high levels of precipitation.
O c. there is more precipitation at mid-latitudes.
O d. there is more river runoff at the Equator than at mid-latitudes.
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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