A road was recently built through a mountain. The cliffs and steep slopes on either side of the road have large, loose rocks exposed. Drivers on this road should be concerned because A. gravity and erosion could cause the rocks to fall or slide onto the road. B. gravity and erosion might cover the rocks back up again. C. these rocks make the hillsides look ugly. D. the road is not sturdy since these rocks were not placed underneath it.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

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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