What is the volume in ml of one pound of mercury?

The volume of 1 lb Hg is 33.45 mL.

Mass of Hg = 1 lb × (453.6 g/1 lb) = 453.6 g

Volume of Hg = 453.6 g × (1 mL/13.56 g) = 33.45 mL

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