Cho 18,5 gam hỗn hợp X (Fe, Fe3O4) tác dụng với 200 ml dung dịch HNO3 loãng đun nóng và khuấy đều. Sau khi phản ứng xảy ra hoàn toàn thu đươc 2,24 lít khí NO duy nhất (đktc), dung...

* Hướng dẫn giải

Xét hỗn hợp X gồm Fe, O

\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeaacaGaaiaabeqaamaabaabaaGcbaGaamiwamaace % aaeaqabeaacaWGgbGaamyzaiaacQdacaWG4bWaaWbaaSqabeaacaWG % TbGaam4BaiaadYgaaaaakeaacaWGpbGaaiOoaiaadMhadaahaaWcbe % qaaiaad2gacaWGVbGaamiBaaaaaaGccaGL7baacqGHsgIRdaGabaab % aeqabaGaaGynaiaaiAdacaWG4bGaey4kaSIaaGymaiaaiAdacaWG5b % Gaeyypa0JaaGymaiaaiIdacaGGSaGaaGynaiabgkHiTiaaigdacaGG % SaGaaGinaiaaiAdaaeaacaaIYaGaamiEaiabgkHiTiaaikdacaWG5b % Gaeyypa0JaaGimaiaacYcacaaIXaGaaiOlaiaaiodaaaGaay5EaaGa % eyOKH46aaiqaaqaabeqaaiaadIhacqGH9aqpcaaIWaGaaiilaiaaik % dacaaI3aaabaGaamyEaiabg2da9iaaicdacaGGSaGaaGymaiaaikda % aaGaay5EaaGaeyOKH4Qaam4qamaaBaaaleaacaWGnbaabeaakiabg2 % da9maalaaabaGaaGimaiaacYcacaaIXaGaaiOlaiaaisdacqGHRaWk % caaIWaGaaiilaiaaigdacaaIYaGaaiOlaiaaikdaaeaacaaIWaGaai % ilaiaaikdaaaGaeyypa0JaaG4maiaacYcacaaIYaGaamytaaaa!7E4D! X\left\{ \begin{gathered} Fe:{x^{mol}} \hfill \\ O:{y^{mol}} \hfill \\ \end{gathered} \right. \to \left\{ \begin{gathered} 56x + 16y = 18,5 - 1,46 \hfill \\ 2x - 2y = 0,1.3 \hfill \\ \end{gathered} \right. \to \left\{ \begin{gathered} x = 0,27 \hfill \\ y = 0,12 \hfill \\ \end{gathered} \right. \to {C_M} = \frac{{0,1.4 + 0,12.2}}{{0,2}} = 3,2M\)