Question

calculate the percentage of nitrogen in NH2NH2​

Answer 1

$\huge{\underline{\tt Solution:-}}$

Given Element:-

$\\ \sf\bull\dashrightarrow NH_2NH_2$

Molecular mass:-

$\\ \sf\bull\dashrightarrow 12+(2\times 1) +12+(2\times 1)$

$\\ \sf\bull\dashrightarrow 12+2+12+2$

$\\ \sf\bull\dashrightarrow 14+14$

$\\ \sf\bull\dashrightarrow 28u$

Atomic mass of Nitrogen in the compound:-

$\\ \sf\bull\dashrightarrow 12\times 2=24u$

Percentage of N:-

$\boxed{\sf Mass℅ \:of\:an\:element=\dfrac{Mass\:of\:that\:element\:in\;one\;mole\:of\:the\:compound}{Molar\:mass\;of\:the\:Compound}\times 100}$

$\\ \sf\bull\dashrightarrow Mass℅\:of\: N=\dfrac{24}{28}\times 100$

$\\ \sf\bull\dashrightarrow \dfrac{24\times 100}{28}$

$\\ \sf\bull\dashrightarrow \dfrac{2400}{28}$

$\\ \sf\bull\dashrightarrow \boxed{\sf Mass℅\:of\:Nitrogen=85.7℅}$