PLEASE PLEASE HELP ME
Which of the following is a compound?
A. Lead
B. Air
C. Water
D. Sodium

particle   p is an electron and particle q is a neutron

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose 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