Question

The molecular mass of a compound X is 18 u. Calculate the number of molecules present in 54g of X. The molecular mass of a compound X is 18 u. Calculate the number of molecules present in 54g of X. ​

Answer 1

Your answer

if the molecular mass of a compound is 18u, then it must weigh 18g in one mole, and one mole of the  compound contains 6.022 × 10²³ molecules

So, 54g will contain:  $\frac{54}{18}$ = 3 moles

3 moles will have: 3 × 6.022 × 10²³ molecules = 18.066 × 10²³ molecules

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Answer 2

Answer:

if the molecular mass of a compound is 18u, then it must weigh 18g in one mole, and one mole of the compound contains 6.022 × 10²³ molecules

So, 54g will contain

18

54

= 3 moles

3 moles will have: 3 × 6.022 × 10²³ molecules = 18.066 × 10²³ molecules