An unknown gas shows a density of 3 g per litre at 273°C and 1140 mm Hg pressure. What is the gram molecular mass of this gas?

Given: P = 1140 mm Hg Density = D = 3 g per L T = 273 °C = 273 + 273 = 546 K gram molecular mass = ? At S.T.P., the volume of one mole of any gas is 22.4 L Volume of unknown gas at S.T.P. = ? By Charle’s law. V 1 = 1 L T 1 = 546 K T 2 = 273 K V 2 = ? = Hence, V 2 = x 273 = 0.5 L Volume at standard pressure = ? Apply Boyle’s law. P 1 = 1140 mm Hg V 1 = 0.5 L P 2 = 760 mm Hg V 2 = ? P 1 × V 1 = P 2 × V 2 V 2 = = 0.75 L Now, 22.4 L = 1 mole of any gas at S.T.P., then 0.75 L = = 0.0335 moles The original mass is 3 g Molecular mass = = = 89.55 ≈ 89.6 g per mole Hence, the gram molecular mass of the unknown gas is 89.6g

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(b) The volume of 4 g of H₂ at 4 atmospheres.
(c) The mass of oxygen in 2.2 litres of CO₂ at S.T.P.

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Chemistry

An unknown gas shows a density of 3 g per litre at 273°C and 1140 mm Hg pressure. What is the gram molecular mass of this gas?

Mole Concept

Related Questions

Calculate:
(a) The gram molecular mass of chlorine if 308 cm³ of it at S.T.P. weighs 0.979 g
(b) The volume of 4 g of H₂ at 4 atmospheres.
(c) The mass of oxygen in 2.2 litres of CO₂ at S.T.P.

A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10^-12 g, calculate the number of carbon atoms in the signature.

Cost of Sugar (C₁₂H₂₂O₁₁) is ₹40 per kg; calculate it's cost per mole.

Calculate the number of molecules in one kg of NaOH.

Chemistry

An unknown gas shows a density of 3 g per litre at 273°C and 1140 mm Hg pressure. What is the gram molecular mass of this gas?

Mole Concept

Related Questions

Calculate:(a) The gram molecular mass of chlorine if 308 cm3 of it at S.T.P. weighs 0.979 g(b) The volume of 4 g of H2 at 4 atmospheres.(c) The mass of oxygen in 2.2 litres of CO2 at S.T.P.

A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.

Cost of Sugar (C12H22O11) is ₹40 per kg; calculate it's cost per mole.

Calculate the number of molecules in one kg of NaOH.

Calculate:
(a) The gram molecular mass of chlorine if 308 cm³ of it at S.T.P. weighs 0.979 g
(b) The volume of 4 g of H₂ at 4 atmospheres.
(c) The mass of oxygen in 2.2 litres of CO₂ at S.T.P.

A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10^-12 g, calculate the number of carbon atoms in the signature.

Cost of Sugar (C₁₂H₂₂O₁₁) is ₹40 per kg; calculate it's cost per mole.