In the early periodic tables some elements were placed in the wrong groups, how did Mandeleev overcome this.

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Gymnast always perform on padded mats. how does the mats protect the gymnast

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood