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[tex]\tt a)[/tex]
[tex]\boxed{\begin{array}{l}\sf0,2 kg=200g\\\sf0,1kg=100g\\\sf 3H_2+N_2\longrightarrow 2NH_3\\\sf 6~g~de~H_2\longrightarrow 28~g~de~N_2\\\sf x\longrightarrow 100g~de~N_2\\\sf x=\dfrac{100\cdot6}{28}\\\sf x=21,42~g\\\sf 6~g~de~H_2\longrightarrow 28~g~de~N_2\\\sf200 g~de~ H_2\longrightarrow x\\\sf x=\dfrac{28\cdot200}{6}=933,33~g~de~N_2\\\sf teoricamente,100 g~de~N_2~produziria~100~g~de~H_2\\\sf por\acute em~ isso~n\tilde ao~se~confirmou.\\\sf N_2\to reagente~em~excesso\\\sf H_2\to reagente~limitante\end{array}}[/tex]
[tex]\tt b)[/tex]
[tex]\boxed{\begin{array}{l}\sf 6~g~de~H_2\longrightarrow34 ~g~de~NH_3\\\sf200 g~de~H_2\longrightarrow x\\\sf x=\dfrac{200\cdot34}{6}\\\sf x=1133,33~g~de~NH_3\end{array}}[/tex]