The molecular weight of a gas that has a density of 5.75 g/l at stp is g/mol.

Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

Now put all the given values in this formula, we get the molecular weight of a gas.

Therefore, the molecular weight of a gas is, 128.9 g/mole

128.8 g/mole.

Given:

Density of a gas = 5.75 g/l at STP

Question:

The molecular weight of this gas (in g/mol)

The Process:

This is a stoichiometric calculation.We will find out the molecular weight (or molar mass) of the gas measured at STP with known density.

Remember at STP 1 mole of gas = 22.4 L or referred to as a molar volume.

From the value of the gas density, we know that 1 L of gas has a mass of 5.75 g.

The relationship between the mole (n), mass (m), molecular weight (M), volume (V), and molar volume (Vm) is as follows:

Let us calculate the molecular weight.

Thus the molecular weight of a gas that has a density of 5.75 g/L at STP equal to 128.8 g/mole.

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Notes:

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explanation:

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