Question

Na reação N2(g) + 3 H2(2)→ 2 NH3(g), qual é a massa de NH,
obtida quando reagem totalmente 3 g de H?
(Consulte a Tabela Periódica.)​

Answer 1

$\boxed{\begin{array}{l}\underline{\rm c\acute alculo~da~massa~molar:} \\\sf m_{2NH_3}=2\cdot(14+3\cdot1)=2\cdot17=34~g/mol\\\sf m_{3H_2}=3\cdot2\cdot1=6~g/mol\\\sf 34~g~de~NH_3\longrightarrow6~g~de~H_2\\\sf x\longrightarrow 3~g~de~H_2\\\sf 6x=34\cdot3\\\sf x=\dfrac{17\cdot\diagup\!\!\!2\cdot\diagup\!\!\!3}{\diagup\!\!\!3\cdot\diagup\!\!\!2}\\\sf x=17~g~de~NH_3\end{array}}$