a gas mixture is the sum of The gas temperature and volume The pressures of the gases divided by their masses. The partial pressures of each gas The number of molecules in the container

The correct answer is:<br /><br />**The partial pressures of each gas.**<br /><br />### Explanation:<br />This concept is based on **Dalton's Law of Partial Pressures**, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas in the mixture. Mathematically, this can be expressed as:<br /><br />\[<br />P_{\text{total}} = P_1 + P_2 + P_3 + \dots<br />\]<br /><br />Where \(P_1, P_2, P_3, \dots\) are the partial pressures of the individual gases in the mixture. Each partial pressure is the pressure that the gas would exert if it alone occupied the entire volume of the container at the same temperature.<br /><br />