Plz solve the question attached 2nd question
Answers
Answer:
(i) 1 molecule of methane contains 10 electrons (6 from carbon, 4 from hydrogen)
Therefore, 1 mole of methane contains 10xNA = 6.022x10^24 electrons.
(ii) Number of neutrons in 14g (1 mol) of 14C = 8xNA = 4.817x10^24 neutrons.
Number of neutrons in 7 mg (0.007g) = (0.007/14)x4.817x10^24
= 2.409x10^21 neutrons.
Mass of neutrons in 7 mg of 14C = (1.67493x10^-27kg)x(2.409x10^21)
= 4.03x10^-6kg
(iii) Molar mass of NH3 = 17g
Number of protons in 1 molecule of NH3 = 7+3 = 10
Therefore, 1 mole (17 grams) of NH3 contains 10*NA = 6.022x10^24 protons.
34 mg of NH3 contains (34/1700)x6.022x1024 protons = 1.204*10^22 protons.
Total mass accounted for by protons in 34 mg of NH3 = (1.67493x10^-27kg) x(1.204x10^22) = 2.017x10^-5kg.
These values remain constant regardless of any change in temperature and pressure (since these factors do not affect the number of protons in the atom and the mass of each proton).