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Anestetic [448]
3 years ago
6

What is the law of conservation of mass

Chemistry
2 answers:
e-lub [12.9K]3 years ago
6 0
Mass can only be transferred
OleMash [197]3 years ago
4 0
Mass is not created nor can it be destroyed, similar to the Law of Conservation of Matter.
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The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.
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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 \frac{1}{22.4}=0.0446 mole of gas

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

Formula used :

\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}

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

0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}

\text{Molecular weight of a gas}=128.9g/mole

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

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