The copper mineral chalcocite, Cu2S, can be converted to copper simply by heating in air according to this balanced equation:

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide