giúp tớ vss ạ
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a) Gọi $n_{Mg} = x(mol) ; n_{Al} = y(mol) \Rightarrow 24x + 27y = 25,5(1)$
$n_{N_2} = \dfrac{5,6}{22,4} = 0,25(mol)$
Bảo toàn electron : $2n_{Mg} + 3n_{Al} = 10n_{N_2} \Rightarrow 2x + 3y = 0,25.10(2)$
Từ (1)(2) suy ra : x = 0,5 ; y = 0,5
$m_{Mg} = 0,5.24 = 12(gam)$
$m_{Al} = 0,5.27 = 13,5(gam)$
b) $n_{Mg(OH)_2} = x = 0,5(mol) ; n_{Al(OH)_3} = y = 0,5(mol)$
$\Rightarrow m_{Kết\ tủa} = 0,5.58 + 0,5.78 = 68(gam)$
1 Life in the country is not as good as life in the city
2 These room are cleaned every evening
3 Would you mind decorating the christmas tree
4 It's the first time I have talked to the headmaster
V
1 have ever met
2 worked
3 reading
4 are looking - seeing
5 was
VI
1A
2A
3D
4D
5B
Bạn tham khảo lời giải tại đây:
https://hoc24.vn/cau-hoi/giai-pt-sqrtx-2sqrt4-x2x2-5x-1.219493072549
\(32\) x \(47,8+320\) x \(0,1+3200\) x \(0,512\)
\(=32\) x (\(47,8+10\) x \(0,1+100\) x \(0,512\))
\(=32\) x [(\(47,8+\) (\(10\) x \(0,1\)) \(+\) (\(100\) x \(0,512\))
\(=32\) x (\(47,8+1+51,2\))
\(=38\) x \(100\)
\(=3800\)
12 This matter to which you should pay attention is of great importance
13 The woman to whom you gave place on the bus lives next door to me