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Q.

The measured density at STP of He is 0.1762 g/L What is the weight of one mole of He(nearest integer)?

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answer is 4.

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Detailed Solution

On the periodic table, the molar mass is the mass of one mole of an element. Helium has a molar mass per mole of 4.0 grams, according to a calculation of this value. Therefore, a mole of helium weighs 4.0 grams.

0.1762×22.4=3.9464

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The measured density at STP of He is 0.1762 g/L What is the weight of one mole of He(nearest integer)?