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Vladimir79 [104]
2 years ago
12

Which sample would have the same number of molecules as 11.2L of He (g) at 273K and 202kPa?

Chemistry
1 answer:
bazaltina [42]2 years ago
8 0

Answer: 11.2 L of CH_4(g) at 273K and 202kPa

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 202 kPa = 1.99 atm  ( 1kPa= 0.0098 atm)

V = Volume of gas = 11.2 L

n = number of moles = ?

R = gas constant =0.0821Latm/Kmol

T =temperature =273K

n=\frac{PV}{RT}

n=\frac{1.99\times 11.2}{0.0821 L atm/K mol\times 273K}=0.99moles

According to avogadro's law, equal number of moles occupy equal volumes and contain equal number of molecules at same temperature and pressure conditions.

As 11.2 L of CH_4(g) at 273K and 202kPa will have same moles as 11.2L of He (g) at 273K and 202kPa, thus they have same number of molecules.

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