find out molar mass of a gas 0.1g weight and volume 56ml at s.t.p
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The molar mass of gas is 40 g/mol.
We have to find out the molar mass of a gas of 0.1g weight and volume 56ml at STP.
Given,
- Weight of gas, w = 0.1 g
- volume of gas at STP = 56 ml
We know, volume of one mole of an ideal gas is 22.4L at STP.
∴ no of moles of gas = volume of gas at STP/22.4L
= 56ml/22.4L
= 56/22400 ml [∵ 1000 ml = 1L]
= 0.0025 mol
We know, no of moles = weight in gram/molar mass of gas
⇒ 0.0025 = 0.1g/molar mass of gas
⇒ molar mass of gas = 0.1g/0.0025 mol
⇒ molar mass of gas = 40 g/mol
Therefore the molar mass of the gas is 40 g/mol.
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