VSA : Give the number of molecules is 2 g hydrogen

Question

Give the number of molecules is 2 g hydrogen. [Ans. 6.022 × 10²³]

Answer

Step 1: Calculation of Molar mass

The molar mass of hydrogen (H₂) = 2 × 1 = 2

Step 2: Calculation of number of moles

Number of moles of hydrogen = Mass\ of\ hydrogen \over Molar\ mass\ of\ hydrogen

= 2\over2 = 1

Step 3: Calculation of number of molecules

Number of molecules of hydrogen = Number of moles of hydrogen × Avogadro’s number

= 1 × 6.022 × 10²³

= 6.022 × 10²³ molecules