A researcher studying the nutritional value of a new candy places a 4.40 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.45 ∘C. If the heat capacity of the calorimeter is 45.50 kJ⋅K−1, how many nutritional Calories are there per gram of the candy?Calories per gram of candy:Cal/g

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

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

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