1 poi Jose and Zak want to ride their bikes from their neighborhood to school,
which is 14.4 kilometers away. It takes Zak 40 minutes to arrive at school.
Jose arrives 20 minutes after Zak. What is Zak's speed?

level 4 to level 2 : ))

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

c. orbital shape i hope this is correct