A cold trap is set up to cause molecules to linger near the suction in a vacuum

Question

A cold trap is set up to cause molecules to linger near the suction in a vacuum system. If the cold trap has an effective volume of 0.200 L and is maintained at   , how many molecules are in it at 10.0  of pressure? (Avogadro's number is 6.022 × 1023 molecules/mol, and the universal gas constant is 8.314 . Assume the behavior of an ideal gas.

Pleas show all work, and please do not present answers that are not one of the choices. Also, please specify the correcta answer at the bottom. Thank you!!!

1.3 ×10 22 molecules B. 9.1075215 ×10 23 molecules C. 9.1075215 ×10 20 molecules D. 1.3172727 ×10 19 molecules

Explanation / Answer

Use PV = nRT

10*0.200 = n*8.314*11

number of moles = 0.02186

Number of molecules = 0.02186 * 6.022 x 10^23 = 0.13169 x 10^23

Number of molecules = 1.3 x 10^22

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