Not all substances heat up and cool down at the same rate. A substance's resistance to temperature change is described by its specific heat capacity, or specific heat for short. For example, the specific heat of iron is 0.46 J/g °C. That means it takes 0.46 joules of heat energy to increase the temperature of a gram of iron by one degree Celsius.

a. they are both space stations

happy to

pls mark as brainliest.

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