Question

calculate the number of moles present in 2 grams of H2​

Answer 1

Answer:

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Explanation:

no. of moles=given mass/molar mass

given mass=2g

molar mass= h2= 1(2)

=> 2u

:-> therefore, no. of moles is 1 moles

Answer 2

Hint: Hydrogen is a diatomic molecule i.e. it is found in pairs. We know, two gram of hydrogen contains one mole of hydrogen. One mole is equal to Avogadro's number.

According to the basic mole concept, one mole of any atom is equal to the one gram of that element; but if we talk about the hydrogen in this case,1 mole of hydrogen = 2 g of hydrogen, due to diatomic existence.

Now, we can say that one mole is equal to Avogadro’s no. i.e. 6.022 × 10²³molecules.

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