A41.1 g sample of solid co2 (dry ice) is added to a container at a temperature of 100 k with a volume of 3.4 l. a. if the container is evacuated (all of the gas removed), sealed, and then allowed to warm to room temperature t = 298 k so that all of the solid co2 is converted to a gas, what is the pressure inside the container?

Approximately 6.81 × 10⁵ Pa.

Assumption: carbon dioxide behaves like an ideal gas.

Explanation:

Look up the relative atomic mass of carbon and oxygen on a modern periodic table:

Calculate the molar mass of carbon dioxide :

.

Find the number of moles of molecules in that sample of :

.

If carbon dioxide behaves like an ideal gas, it should satisfy the ideal gas equation when it is inside a container:

,

where

Rearrange the equation to find an expression for , the pressure inside the container.

.

Look up the ideal gas constant in the appropriate units.

.

Evaluate the expression for :

.

Apply dimensional analysis to verify the unit of pressure.

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