1. Which of the following metric relationships is INCORRECT? A) 1 microliter = 10-6 liters
B) 10 decimeters = 1 meter
C) 103 milliliters = 1 liter
D) 1 gram = 102 centigrams
E) 1 gram = 103 kilograms

C. 103 milliliters = 1 liter

Explanation:

There are 1000 milliliters in 1 liter

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