$$E=mc^2$$ Better - Malayalam Kambikathakal Net
Or, for chemical equations: Chandi Veeran Tamilyogi Nothing New. It
$$2H_2 + O_2 \rightarrow 2H_2O$$
These are basic examples; your study materials will likely include more complex equations and formulas. Finding a specific solution manual like the "solucionario quimica general petrucci 10 edicion pdf" requires patience and sometimes persistence. Always consider the legal and safe sources first. If you're having trouble finding what you need, you might want to consider reaching out to your instructor or a university for guidance.