A gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures: 134 mmHg CO2, 214 mmHg Ar, and 190 mmHg O2. The mixture also contains helium gas. Part A What is the partial pressure of the helium gas? Express your answer in millimeters of mercury.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

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it is the most commonly accepted one