Chapter 14

 4) 1 cm^3 of water weighs 1g  ===> 6 10^-4 m^3 of water weighs 600 g
    1 mole of water weighs 1+1+16 = 18 g
    glass of water contains 600/18 = 33.3 moles 
    glass of water contains 33.3 * 6.022 10^23 =2 10^25 molecules

 6) one mole of Tylenol = 8*12+9*1+14+2*16 = 151 g
    number of molecules in 0.325g of Tylenol = 
           = 0.325/151 * 6.022 10^23 = 1.296 10^21
    one mole of ibuprofen = 13*12+18*1+2*16= 206 g
    number of molecules in 0.200g of ibuprofen =
           = 0.200/206 * 6.022 10^23 = 0.584 10^21

17) volume                   V = 5 10^-4 m^3
    pressure                 P = 1 10^5  Pa
    temperature              T = 310     K
    Boltzmann's constant     k = 1.38 10^-23 J/K
    total number of gas molecules
                            N = PV/kT =1.1688 10^22
    number of oxygen molecules = 0.21 * N = 2.45 10^21