A gaseous mixture composed of 16.0 g of O, 21.0 g of N, and 16.0 g of He at 20.0°C is confined in a 25.0 L container. What is the partial pressure of He in this mixture?

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

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