First, the [[Mass|mass]] of a mixture and the total mass fraction, $m_{tot}$​ and $c_i$. $m_{tot}=\sum_{i=1}^km_i$ $c_i=\dfrac{m_i}{m_{tot}}\quad\text{and}\quad\sum_{i=1}^kc_i=1$ Secondly, we have the total number of [[Mole|moles]] in a mixture and the mole fraction, $n_{tot}$​ and $y_i$. $n_{tot}=\sum_{i=1}^kn_i$ $y_i=\dfrac{n_i}{n_{tot}}\quad\text{and}\quad\sum_{i=1}^ky_i=1$ Finally, a relation that should be familiar, the relation of [[Molar Mass|molar mass]], mass, and moles. $n=\dfrac{m}{M}$