Which is the least dense? 1000 g of water 1000 g of feathers 1000 g of concrete 1000 g of mercury

Calculate the change in entropy if br2(l) is converted to br2(g). s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

Which orbitals form a pi bond? a.the s orbital and three p orbitals b.the s orbital and two p orbitals c.overlapping p orbitals d.overlapping hybrid orbitals

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.