Question

cho 2 7g nhom tac dung het voi h2so4 loang:

1. viet PTHH

2. tinh khoi luong muoi nhom tao thanh

3. cho luong nhom tren tac dung vua du voi 200 g dung dich HCl. Tinh nong do phan tram cua dung dich HCl can dung

Answer 1

Answer 2

nAl= 27/27=1 mol

2Al + 3H2SO4 --> Al2(SO4)3 + 3H2

1________________0.5

mAl2(SO4)3= 0.5*342=171g

2Al + 6HCl --> 2AlCl3 + 3H2

1_____3

mHCl= 3*36.5=109.5g

C%HCl= 109.5/200*100%= 54.75%

Answer 3

1) PTHH: 2Al + 3H₂SO₄ \(\rightarrow\) Al₂(SO₄)₃ + 3H₂\(\uparrow\)
2) n_Al = \(\frac{27}{27}=1\left(mol\right)\)
Theo PT: n\(Al_2\left(SO_4\right)_3\) = \(\frac{1}{2}\) n_Al = 0,5(mol)
=> m_{\(Al_2\left(SO_4\right)_3\)} = 0,5.342= 171 (g)
3) PTHH: 2Al + 6HCl \(\rightarrow\) 2AlCl₃ + 3H₂\(\uparrow\)
Theo PT: n_HCl = 3n_Al = 3.1 = 3 (mol)
=> m_HCl = 3.36,5 = 109,5(g)
=> C% _HCl = \(\frac{109,5}{200}.100\%=54,75\%\)