Question

how many molecules are present in 1 kg of hydrogen​

Answer 1

Question :

how many molecules are present in 1 kg of hydrogen​ ?

Answer :

1000 moles

The atomic mass of hydrogen is 1 g/mole. To make up 1 kilogram or 1000 g of hydrogen element, 1000 moles of hydrogen is required. Each mole has a Avogadro's number of atoms or atoms. Thus, 1 kg hydrogen element or 1000 moles of hydrogen have atoms (or 1000 times the Avogadro's number).

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Answer 2

Concept:

The number of moles can be calculated as the ratio of the given mass to the molecular mass.

N = m/M

where N is the number of moles, m is the given mass and M is the molecular mass.

Given:

The mass of the sample is 1 kg of hydrogen​.

Given mass = 1 kg = 1000g

Find:

The number of molecules present in 1 kg of hydrogen​.

Solution:

1 molecule of hydrogen contains 2 atoms of hydrogen. So, the molecular mass of the hydrogen is 2.

Number of moles, N = Given mass/ Molecular mass

N = 1000/2

N = 500 moles

The 1 kg of hydrogen contains 500 moles.

1 mole contains 6.022 × 10²³ molecules.

500 moles contain 6.022 × 10²³ × 500 = 3.011 × 10²⁶  molecules.

Hence, the total number of molecules present in the 1 kg of hydrogen is 3.011 × 10²⁶.

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