Question

Calculate the total number of atoms present in 'M' grams of any substance, if the number of atoms in one molecule of that substance is 'K' and gram molecular weight of the substance is 'W' grams :

• A. $\frac{m}{W}\times 6.023\times {10}^{22}\times K$
• B. $\frac{m}{W}\times 6.023\times {10}^{23}\times K$
• C. $\frac{W}{m}\times 6.023\times {10}^{23}\times K$
• D. $\frac{W}{m}\times 6.023\times {10}^{22}\times K$

Answer 1

Answer: (B)

$\frac{m}{W}\times 6.023\times {10}^{23}\times K$

'M' grams of substance moles = $MW\times K$

number of atoms = $MW\times K\times Na$ = $\frac{M}{W}$ x $6.023\times {10}^{23}\times K$

ans is B