Question

I need help with chemistry please help thank you so much

Answer 1

Step-by-step explanation:

We are given: Pressure of krypton gas = 0.644 atm

: Temperature of krypton gas = 281 K

: Volume of krypton gas = 0.855 L

We know: Ideal gas constant = 0.082 L.atm/K.mol

We use the ideal gas law to find the number of moles:

`\begin{gathered} PV\text{ = nRT} \\ \\ \therefore n\text{ = }(PV)/(RT) \\ \\ \text{ = }(0.644*0.855)/(0.082*281) \\ \\ \text{ = 0.024 mol} \end{gathered}`

Answer:

Moles of Kr in the sample is 0.024 mol.