Given the balanced equation below for the highly exothermic reaction of aluminum with oxygen to form aluminum oxide: What is the value of ΔH when 1.00 mol of aluminum reacts? What is the value of ΔH when 5.23 g of aluminum reacts? What is the value of ΔH when 6.17 L of oxygen gas at STP reacts with excess aluminum? A certain reaction releases 6881 kJ of heat. What mass of aluminum oxide was produced in the reaction?

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

a

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