甲、論文

立足臺灣，放眼天下

沒有 【段考】國二歷史上學期 權限，請先開通．

沒有 【段考】國二歷史上學期 權限，請先開通．

沒有 【段考】國二歷史上學期 權限，請先開通．

沒有 【段考】國二歷史上學期 權限，請先開通．

沒有 【段考】國二歷史上學期 權限，請先開通．

(A) A) is the mass spectrum of a 3-heptanone sample obtained under positive ion mode showing the protonated molecular species [MH]+ with a major peak at 114 + 1 ~ 115 (m/z). This 3-hetpanone sample is chromatographically pure with only a single peak on HPLC. Why does it have a small peak at 116 (m/z) on the mass spectrum? (4%)

(B)B) is the mass spectrum of an unknown organic molecule obtained under positive ion mode. Estimate the number of protons associated with this ion and the mono-isotopic mass of this molecule. Show your work. (3%)

(A) A) is the 1H NMR spectrum of 3-hetanone. Hydrogens associated with each carbon are labeled in the molecular structure shown below. Assigned each group of peaks from left to right on the NMR spectrum with lower-case letters (a-f). (4%)

(B) Homonuclear decoupling is a technique where the sample to be analyzed is irradiated at a select frequency to eliminate the effect of coupling due to certain nuclei. In other words, the signal of a select nucleus can be selectively saturated, such that this nucleus can no longer couple to neighboring nuciei. This technique helps to simplify complicated peak splitting. Irradiation at which group of protons (a-f) would result in spectral simplification in the 2.3 - 2.6 ppm range as shown in B)? Use the same lower-case letter(s) notation in A). (3%)

(a) (8 pts) Integrate the first and the second laws Tds = dU + PdV - μdn, together with the above conditions (a)(b)(c), to obtain the entropy formula S(U, V,n), which is a function of U,V and n (and T, P, μ are all eliminated).

115年 - 115 關務特種考試_四等_各科別：國文（作文與測驗）#138992

115年 - 115 關務特種考試_三等_各科別：國文（作文與測驗）#138899

114年 - 114 地方政府公務特種考試_四等_各類科：國文（作文與測驗）#134660

114年 - 114 地方政府公務特種考試_三等_各類科（除公職社會工作師、公職獸醫師、公職建築師外）：國文（作文與測驗）#134485

114年 - 114-2 司法官特種考試_三等_司法官及律師、專技高考_律師_各類科：國文（作文）#132428

114年 - 114 外交特種考試_四等_外交行政人員類科行政組：國文（作文與測驗）#130955

114年 - 114 外交、國際經濟商務、民航特種考試_三等_各類科組：國文（作文與測驗）#130943

114年 - 114 司法、調查、海岸巡防特種考試_三等_各類科組：國文（作文與測驗）#129584

114年 - 114 司法、海岸巡防特種考試_四等_各類科組：國文（作文與測驗）#129490

114年 - 114 高等考試_三級_各類科（除公職社會工作師、公職獸醫師、公職建築師、公職護理師、公職食品技師、公職醫事檢驗師、公職藥師外）：國文（作文與測驗）#128603