Pressure is equal to force per unit area. P=F/A therefore F=PA A brick has the following dimensions, 1.00 mx 0.200 m x 0.500 m. The pressure exerted
by the brick on the floor is different when the brick is placed in different ways. If the
minimum pressure exerted by the brick on the floor is 100.0 Pa, what is the force
exerted on the floor in newtons (N)?
O 200. N
0 50.0 N
O 10.0 N
O 100, N

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

the correct answer would be b) volume versus temperature, because they are also directly proportional.