how does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen? 1) 1 mol of oxygen has fewer molecules.2) 1 mol of oxygen has more molecules.3) each sample has the same number of molecules.4) the molecules cannot be compared without knowing the mass.

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

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

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?