a,ร nghฤฉa:
-cรณ 3 nguyรชn tแปญ Ca vร 2 phรขn tแปญ PO4
Nguyรชn tแปญ khแปi : 3.12+95.2=226 ฤvc
b,
%mCa=12.3:226.100%=15,93%
%mP=2.31:226.100%=27,43%
%mO=100%-15,93%-27,43%=56,64%
c,
ย mO=MCa3(Po4)2.56,64%=31.56,64%=17,56g
ฤรกp รกn:
ย
Giแบฃi thรญch cรกc bฦฐแปc giแบฃi:
ย a) ร nghฤฉa cแปงa `Ca_3(PO_4)_2`
- Trong phรขn tแปญ trรชn chแปฉa nguyรชn tแป Canxi ; Photpho vร Oxi
- Trong phรขn tแปญ trรชn cรณ 3 nguyรชn tแปญ Canxi ; 2 nguyรชn tแปญ Photpho vร 8 nguyรชn tแปญ Oxi
- `PTK = 40 * 3 + 31 * 2 + 16 * 8 = 310 ( ฤvC )`
b)
`%_(Ca) = `$\dfrac{40 ร 3 }{310}$ `ร100% = 38.71 %`
`%_(P) = `$\dfrac{31 ร 2ย }{310}$ `ร100% = 20 %`
`%_(O) = `$\dfrac{16ร8 }{310}$ `ร100% = 41.29 %`
c)
`n_(Ca_3(PO_4)_2) = 31 / 310 = 0.1 ( mol ) `
`BTBT (O) : n_(O) = 8 n_(Ca_3(PO_4)_2) = 8 * 0.1 = 0.8 ( mol ) `
`m_(O) = 0.8 ร 16 = 12.8 ( g ) `
Hรณa hแปc, mแปt nhรกnh cแปงa khoa hแปc tแปฑ nhiรชn, lร ngร nh nghiรชn cแปฉu vแป thร nh phแบงn, cแบฅu trรบc, tรญnh chแบฅt, vร sแปฑ thay ฤแปi cแปงa vแบญt chแบฅt.Hรณa hแปc nรณi vแป cรกc nguyรชn tแป, hแปฃp chแบฅt, nguyรชn tแปญ, phรขn tแปญ, vร cรกc phแบฃn แปฉng hรณa hแปc xแบฃy ra giแปฏa nhแปฏng thร nh phแบงn ฤรณ.Hรณa hแปc ฤรดi khi ฤฦฐแปฃc gแปi lร "khoa hแปc trung tรขm" vรฌ nรณ lร cแบงu nแปi cรกc ngร nh khoa hแปc tแปฑ nhiรชn khรกc nhฦฐ vแบญt lรฝ hแปc, ฤแปa chแบฅt hแปc vร sinh hแปc.
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