Question

The mass of one molecule of a substance is 2.989×10^-22g.What is its molecular mass?​

Answer 1

Answer:-

180u

Explanation:-

Given that mass of one molecule of a substance is 2.989×10⁻²²g and we need to find the molecular mass of the substance.

Now we know that:-

→ Molecular mass = Mass of 1 mole --(1)

→ 1 mole = 6.023×10²³ molecules --(2)

Now, from eq. 1 and eq.2, we get:-

Molecular mass = Mass of 6.023×10²³

molecules

Hence:-

• Mass of 1 molecule = 2.989×10⁻²²g

Thus, mass of 6.023×10²³ molecules :-

= 2.989×10⁻²²×6.023×10²³

= 18×10²³⁻²²

= 18×10

= 180g

As we know that the unit of molecular mass is 'u' or 'amu'.

Thus, molecular mass of the substance 180u.

Answer 2

Answer:

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