[考題] 請問103中區理化倒數3題(題組) Q.48.49.50
48~50 為題組題:
有關市售雙氧水的定量實驗步驟,通常取市售雙氧水10.0 mL 加水稀釋成100.0 mL,再取稀釋液10.0 mL 滴加數滴稀硫酸後,
以0.02 mol/L KMnO4 水溶液滴定,若需費17.6 mL 的KMnO4,且該滴定的化學反應式標示如下:
a KMnO4 + b H2O2 + c H2SO4→ d K2SO4 + e MnSO4 + f H2O + g O2
試回答第48~50 題。
48. 該滴定的化學反應式中,係數a~g 的最小整數和為下列哪一數值?
①26 ②28 ③30 ④32
49. 與0.02 mol/L KMnO4 水溶液1.0 mL 反應的H2O2 質量(mg) 接近下列哪一數值?
①1.7 ②2.5 ③3.4 ④5.0
50. 假設該市售雙氧水的密度為1.0 g/mL,則其重量百分濃度(%)最接近下列哪一數值?
①2.5 ②3.0 ③3.5 ④4.0
小弟在第一題係數的計算就卡住了
卡在雙氧水的氧同時變成氧氣和水,有點忘記如何計算
還請各位大大指點~~~
另外想請問各位理化科老師筆試分數如何?
小弟的教育74理化78,這樣子...有機會嗎?
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