Question

Calculate the number of molecules in 150ml of oxygen at 20°C and 750mm pressure.

Answer 1

Answer:

From the Question,

Volume of the Gas(V) = 224 mL.

= 0.224 liter.

Temperature of the Gas(T) = 273 K.

Pressure of the Gas(T) = 2 atm

Now, Using the Formula,

PV = nRT

where, R = Gas Constant = 0.082 L-atm mol⁻¹ K⁻¹

and n = number of moles.

∴ 2 × 0.224 = n × 0.082 × 273

∴ 0.448 = 22.386 × n

⇒ n = 0.448/22.386

⇒ n = 0.02 moles.

Now,

Using the Formula,

No. of molecules = No. of moles × 6.022 × 10²³

= 0.02 × 6.022 × 10²³

= 0.121 × 10²³

Thus, the number of the molecules of the Oxygen gas is 0.121 × 10²³ molecules.

Explanation:

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Answer 2

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