Can you give me all formulas of atoms and molecules as it will help me as exams are approaching?

Number of Moles = $\frac{Givemass}{molecularmass}$
Mass = molar mas$\times$ no. of moles
Number of Moles = $\frac{Numberofparticles}{Avagadronumber\left(N_A\right)}$
where, Avogadro's number = $6.022\times {10}^{23}$6.022×10236.022\times 10^{23} 6.022×10236.022\times 10^{23}6.022×10236.022\times10^{23}6.022×10236.022\times 10^{23}6.022×10236.022\times 10^{23}
$\frac{Givemass}{molecularmass}$ = $\frac{Numberofparticles}{Avagadronumber\left(N_A\right)}$
No. of particles = $\frac{Givenmass}{Molarmass}\times Avagadrono.$
No. of particles = No. of moles $\times N_A$
GivenmassMolarmass×Avagadro number(NA)\frac{Given mass}{Molar mass}\times Avagadro number(N_A)One mole of any species (atoms, molecules, ions, or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams. The number of particles (atoms, molecules, or ions) present in 1 mole of any substance is fixed, with a value of 6.022×10236.022\times 10^{23}$6.022\times {10}^{23}$ 6.022×10236.022\times 10^236.022×10236.022\times 10^{23} 6.022×10236.022\times 10^{23}
Hence, 1 mole of an atom = $6.022\times {10}^{23}$ 6.022×10236.022\times 10^{23} 6.022×10236.022\times 10^{2 = molecular weight of atom
Percentage of any atom in a given compound =$\frac{Massofelement}{Massofcompound}\times 100$