Question

how many atoms in 5g of hydrogen atom​

Answer 1

Answer:

One mole of hydrogen gas(H2) weighs 2g

So, in 5g hydrogen, there are 5/2=2.5 moles of hydrogen.

In 1 mole of hydrogen, there are 6.022×1023 hydrogen molecules.

And in 1 mole of hydrogen, there are 2×6.022×1023 hydrogen atoms.

So, in 2.5 moles of hydrogen, there are 2.5×2×6.022×1023 hydrogen atoms = 30.11×1023 hydrogen atoms.

So, there are 30.11×1023 or 3.011×1023 hydrogen atoms

Answer 2

Answer:

No. Of atoms= no. Of moles x avogadro's number ———(1)

avogadro's number=6.022× 10^23

no. Of moles= given mass /molar mass

given mass=5g

molar mass= 1

therefore, no. Of moles= 5/1 = 5 ———(2)

substituting (2) in (1),

no. Of atoms= 5 x 6.022× 10^23

= 30.11 x 10^23

Hope this helps you!