Question

STP -তে একটি গ্যাসের 112 mL আয়তনের ভর 0.
22g । ঐ নমুনায় কটি অণু আছে ? গ্যাসটির মােলার ভর কত ?​

Answer 1

Mass of 112 ml of a certain gas is 0.22g at STP . how many molecules are there in the sample of gas ? what is the molar mass of the gas

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PrinceFrank

PrinceFrank

Answer:

➜ number of molecules = 30.11 × 10²¹ molecules

➜ molar mass of the gas = 44 g

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Explanation:

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Given,

mass of the given gas, m = 0.22 g

volume of the given gas, V = 112 ml or 0.112 L

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To Find,

☛ number of molecules of the given gas present

☛ molar mass of the gas

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Solution,

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We know,

\\ \boxed{ \sf Number \: of \: moles = \frac{volume \: (in \: litres)}{volume \: of \: gas \: at \: S.T.P(22.4)} } \\

On substituting the values, we get

\\ \\ \sf \rightarrow \quad M = \frac{0.112}{22.4} \\ \\ \sf \rightarrow \quad M = 0.005 \: mol \\ \\

Now,

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1 mol = 6.022 × 10²⁴ atoms / molecules

0.005 mol = 6.022 × 0.005 × 10²⁴

➜ 6.022 × 5 × 10²¹

➜ 30.11 × 10²¹ molecules

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Also,

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No. of moles = Mass given / Molar mass

☛ 0.005 = 0.22 / molar mass

☛ molar mass = 0.22 / 0.005

☛ molar mass = 44 g

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