A 0.114 g Fe sample required 18.7 ml EDTA solution. Find the % Fe2O3( Fw=159.6882 g/mol) in the sample. If 25.0 ml EDTA required 15 ml of 1.1*10 ppm CaCl, (Fw = 110.985 g/mol)

a. they are both space stations

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pls mark as brainliest.

it's c (engineer's do their work with mechanical stuff not on any living being)

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