Cho 6,95 g hỗn hợp X ( Na, Na2O ) và H2O dư. Sau khi các phản ứng xảy ra hoàn toàn thu được 500 ml dung dịch Y và 1,12 lít H2 ở đktc . Tính nồng độ mol của dung dịch Y ?

nguyenthinghia.ksa

2 năm trước

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quocanhseu

`#DyHungg`

Ta có pt:
`2Na + 2H_{2}O -> 2NaOH + H_{2} (1)`

`Na_{2}O + H_{2}O -> 2NaOH (2)`

` n_{H2}=(1,12)/(22,4)=0,05(mol)`

`⇒n_{Na}=0,05xx2=0,1(mol)`

`⇒m_{Na}=0,1xx23=2,3(g)`

`⇒m_{Na2O]=6,95-2,3=4,65 (g)`

`⇒n_{Na2O}=(4,65)/62=0,075 (mol)`

`⇒n_{NaOH}=n_{NaOH (1)} + n_{NaOH (2)}`

`⇒n_{NaOH}=0,1+(0,075xx2)=0,25(mol)`

`⇒C_{M NaOH}=(0,25)/0,5=0,5 (M)`

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562775924460424

Na+H2O→NaOH+1/2H2 (1)

Na2O+H2O→2NaOH (2)

nH2=1,12/22,4=0,05mol

Theo pt nNa=2.nH2=2.0,05=0,1mol

→mNa=0,1.23=2,3g

→mNa2O=6,95-2,3=4,65g

nNa2O=4,65/62=0,075mol

Theo pt (1) nNaOH=nNa=0,1mol

Theo pt (2) nNaOH=2.nNa2O=0,075.2=0,15mol

Tổng nNaOH=0,1+0,15=0,25mol

500ml=0,5l

CM NaOH=n/Vdd=0,25/0,5=0,5M

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