Question

How many molecules are present in one gram of hydrogen?

• A. $6.02\times {10}^{23}$
• B. $3.02\times {10}^{23}$
• C. $2.5\times {10}^{23}$
• D. $1.5\times {10}^{23}$

Answer 1

The correct option is B $3.02\times {10}^{23}$

One gram of hydrogen contains 1 mole of hydrogen as its atomic weight is 1

1 mole $=6.023\times {10}^{23}$ atoms.

But, hydrogen is diatomic molecule.

So, its atom are found in pairs.

Amount of molecule $=3.02\times {10}^{23}$

$\therefore 3.02\times {10}^{23}$ molecules are present in one gram of hydrogen.