Your private gas collection consists of the four following gases, with each gas in a separate container, and exactly 1.0 g of each gas: CO2(g). Ne (g), Cl2 (g), and H2S (g). Which of your prized gases occupies the smallest volume at standard temperature and pressure (STP)?
H2S (g)
CO2 (g)
Cl2 (g)
Ne (g)

Cl2

Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.