The density of lead is 11.342 g/cm3. What would be the volume of a 200.0 g sample of this metal?

v = 17.6cm³

Explanation:

Given data:

density of lead = 11.342 g/cm³

Volume of lead = ?

Mass of lead = 200.0 g

Solution:

Formula:

Density = mass/volume

by putting values,

11.342 g/cm³ = 200.0 g/ v

v = 200.0 g/11.342 g/cm³

v = 17.6cm³

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