Which two samples of gas at stp contain the same total number of molecules?

D) 2L of H2 & 2L of Cl2

Explanation:

As according to universal gas law,

PV=nRT

V=nRT/P

For STP condition, T=273.15K, P=1atm n= 1mole

R=0.0819 L atm / mol K

V= 1*0.082*273.15/1 = 22.4 L

So 1 mole of gas at STP has 22.4L of volume

we know, No. of molecules= no of moles* Avogadro's Number

A) 1L of CO & 0.5L of N2

1L of CO:  

Number of moles in 22.4L of CO = 1

Number of moles in 1L of CO = 1/22.4=0.045 moles

Number of molecules in 1L of CO= 0.045*Avogadro's Number

0.5L of N2

Number of moles in 22.4L of N2= 1

Number of moles in 0.5L of N2= 1/22.4=0.022 moles

Number of molecules in 0.5L of N2= 0.022*Avogadro's Number

So both are not equal, A is not our answer

B) 2L of CO & 0.5L of NH3

1L of CO:  

Number of moles in 22.4L of CO = 1

Number of moles in 2L of CO = 2/22.4=0.089 moles

Number of molecules in 2L of CO= 0.089*Avogadro's Number

0.5L of NH3

Number of moles in 22.4L of NH3= 1

Number of moles in 0.5L of NH3= 1/22.4=0.022 moles

Number of molecules in 0.5L of N2= 0.022*Avogadro's Number

So both are not equal, B is not our answer

C) 1L of H2 & 2L of Cl2

1L of H2:  

Number of moles in 22.4L of H2 = 1

Number of moles in 1L of H2 = 1/22.4=0.045 moles

Number of molecules in 1L of H2= 0.045*Avogadro's Number

2L of Cl2

Number of moles in 22.4L of Cl2= 1

Number of moles in 2L of Cl2= 1/22.4=0.089 moles

Number of molecules in 2L of Cl2= 0.089*Avogadro's Number

So both are not equal, C is not our answer

D) 2L of H2 & 2L of Cl2

2L of H2:  

Number of moles in 22.4L of H2 = 1

Number of moles in 1L of H2 = 2/22.4=0.045 moles

Number of molecules in 2L of H2= 0.089*Avogadro's Number

2L of Cl2

Number of moles in 22.4L of Cl2= 1

Number of moles in 2L of Cl2= 1/22.4=0.089 moles

Number of molecules in 2L of Cl2= 0.089*Avogadro's Number

So both are not equal, D is our answer

distance, luminosity, brightness, radius, chemical composition, and temperature

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?