I will give brainliest!!1.Calculate the density of aluminum if you have a piece of aluminum that has a volume of 48.9cm^3.When the prose is measured it is found to have a mass of 132g. 2.A small amount of copper is found to have a mass of 27g. Calculate the density of copper if the volume of the sample is 3.0cm^3(please show all steps)

c is the answer because when something is left after something evaporates that shows the chemical change.

i'm wiling to try and you : )

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