Cho 16.65 g hon hop x gom Na va Zn phan ung hoan toan trong nuoc du thu duoc dd Y chi chua mot chat tan duy nhat va V lit khi . tinh V?

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Cho 16.65 g hon hop x gom Na va Zn phan ung hoan toan trong nuoc du thu duoc dd Y chi chua mot chat tan duy nhat va V lit khi . tinh V?
Giải:
Ta có phản ứng:
2Na+Zn+3H2O -->Na2[Zn(OH)4] +2H2
Có cách viết khác là:
2Na+Zn+2H2O -->Na2ZnO2 +2H2
Dù cách viết nào thì để chỉ có 1 sản phẩm thì số mol Na bằng hai lần số mol Zn
Gọi x là số mol Zn
Ta có: (23.2+65).x=16.65
=>x=0,15 mol.
=>nH2=2nZn=2x=0,3 mol
Vậy thể tích khí thu được là:
V=0,3.22,4=3,36 lít.

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