Question

How much does mass of $NH_3$ contain same number of atoms as in $4\, g$ atom of oxygen?

• A. $17\, g$
• B. $68\, g$
• C. $42\, g$
• D. $34 \,g$

Answer 1

Answer: (A)

$17\, g$

Answer 2

$4\, g$ atoms of oxygen $= 4\, mol$ of oxygen atoms $= 4\, N_0$ atoms of oxygen $1$ mole of $NH_3 .= N_0$ molecules $= 4\, N_0$ atoms $= 17\, g$