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app.py

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+import gradio as gr
+from sympy import symbols, Eq, lcm, linsolve
+import re
+import pandas as pd
+
+def parse_formula(formula):
+    pattern = r'([A-Z][a-z]?)(\d*)'
+    elements = re.findall(pattern, formula)
+    counts = {}
+    for (elem, num) in elements:
+        num = int(num) if num else 1
+        counts[elem] = counts.get(elem, 0) + num
+    return counts
+
+def balance_equation(reactants, products):
+    elements = set()
+    for compound in reactants + products:
+        elements.update(parse_formula(compound).keys())
+    elements = list(elements)
+    coeffs = symbols(' '.join([f'a{i}' for i in range(len(reactants)+len(products))]), integer=True)
+    equations = []
+    for element in elements:
+        lhs = sum(parse_formula(reactants[i]).get(element, 0) * coeffs[i] for i in range(len(reactants)))
+        rhs = sum(parse_formula(products[i]).get(element, 0) * coeffs[i+len(reactants)] for i in range(len(products)))
+        equations.append(Eq(lhs, rhs))
+    equations.append(Eq(coeffs[0], 1))
+    sol = linsolve(equations, coeffs)
+    if not sol:
+        return None
+    sol = list(sol)[0]
+    denoms = [term.as_numer_denom()[1] for term in sol]
+    multiple = lcm(denoms)
+    coeff_ints = [int(term * multiple) for term in sol]
+    return coeff_ints
+
+def run_app(reactants_input, products_input):
+    reactants = [r.strip() for r in reactants_input.split(',')]
+    products = [p.strip() for p in products_input.split(',')]
+    all_compounds = reactants + products
+
+    data = []
+    for c in all_compounds:
+        parsed = parse_formula(c)
+        for elem, count in parsed.items():
+            side = 'Tham gia' if c in reactants else 'Sản phẩm'
+            data.append({'Chất': c, 'Nguyên tố': elem, 'Số lượng': count, 'Vế': side})
+    df = pd.DataFrame(data)
+
+    coeffs = balance_equation(reactants, products)
+    if coeffs:
+        lhs = ' + '.join(f"{coeffs[i]} {reactants[i]}" for i in range(len(reactants)))
+        rhs = ' + '.join(f"{coeffs[i+len(reactants)]} {products[i]}" for i in range(len(products)))
+        equation = f"✅ Phương trình đã cân bằng:\n\n{lhs} → {rhs}"
+    else:
+        equation = "❌ Không cân bằng được phương trình."
+
+    return df, equation
+
+iface = gr.Interface(
+    fn=run_app,
+    inputs=[
+        gr.Textbox(label="Chất tham gia (cách nhau bằng dấu ,)", placeholder="Ví dụ: Fe, O2"),
+        gr.Textbox(label="Chất sản phẩm (cách nhau bằng dấu ,)", placeholder="Ví dụ: Fe2O3")
+    ],
+    outputs=[
+        gr.Dataframe(label="Bảng nguyên tố & số nguyên tử", wrap=True),
+        gr.Textbox(label="Kết quả phương trình", lines=4)
+    ],
+    title="⚗️ Ứng dụng cân bằng phương trình hóa học",
+    description="Nhập chất tham gia và chất sản phẩm, cách nhau bằng dấu phẩy. App sẽ hiển thị bảng nguyên tố & số nguyên tử + phương trình đã cân bằng."
+)
+
+iface.launch()

requirements.txt

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+gradio
+sympy
+pandas