a sealed flask contains 1 mole of hydrogen and 3 moles of helium at 20. If the total pressure is 400 torr the partial pressure of the hydrogen is​

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Which of the following two events occur to create a sea breeze? select all that apply. warm air rises on the ocean and moves toward the land to cool warm air rises on land and moves toward the ocean to cool cool air moves from the ocean to be warmed by the land cool air moves from the land to be warmed by the ocean

Which of the following units is not an official si unit? mole liter kilogram ampere