Calculate the molecular masses of the following:
(a) Hydrogen, H2
(b) Oxygen, O2
(c) Chlorine, Cl2
(d) Ammonia, NH3
(e) Carbon dioxide, CO2
(Atomic masses: C= 12u, H= 1u, O =16u, Cl = 35.5u, N = 14u)
(a) Molecular mass of Hydrogen (H2) = 2×H = 2×1u = 2u
(b) Molecular mass of Oxygen (O2) = 2×O = 2×16u =32u
(c) Molecular mass of Chlorine (Cl2) = 2×Cl = 2×35.5=71u
(d) Molecular mass of Ammonia (NH3) = 1×N+3×H = 14+3=17u
(e) Molecular mass of Carbon dioxide (CO2) = 1×C+2×O = 12+32 = 44u
Related Articles
- Calculate the molecular masses of H2, O2, Cl2, C02, CH4, C2H2, NH3, CH3OH.
- Calculate the molecular masses of the following compounds:(a) Methane, CH4(b) Ethane, C2H6(c) Ethene, C2H4(d) Ethyne, C2H2(Atomic masses = C= 12u , H= 1u)
- Calculate the molecular masses of the following compounds:(a) Hydrogen sulphide, H2S(b) Carbon disulphide, CS2(Atomic masses: H = 1 u, S = 32 u, C = 12 u)
- Calculate the molecular mass of chloroform(CHCl3).(Atomic masses: C = 12 u; H = 1 u; Cl = 35.5 u)
- Calculate the formula unit massesof ZnO, Na2O, K2CO3, given atomic masses of Zn = 65u, Na = 23u, K = 39, C = 12u, and O = 16u.
- Calculate the molecular mass of hydrogen bromide (HBr).(Atomic masses: H = 1 u; Br = 80 u)
- Calculate the molecular mass of ethanoic acid, CH3COOH.(Atomic masses : C = 12 u; H = 1 u; O = 16 u)
- Calculate the molecular mass of Nitric acid, HNO3.(Atomic masses: H = 1 u; N = 14 u; O = 16 u)
- The molecular formula of glucose is C6H12O6. Calculate its molecular mass.(Atomic masses: C = 12 u ; H = 1 u ; O = 16 u)
- Give the characteristic tests for the following gases(a) CO2(b) SO2(c) O2(d) H2
- What is the molecular mass of-1. H2, 2. O2, 3. Cl2, 4. CO2, 5. CH2, 6. C2H6, 7. C2H4, 8. NH3, 9. CH3OH.
- Calculate the molecular masses of the following compounds:(a) Methanol, CH3OH(b) Ethanol, C2H5OH
- Which contains more molecules, 10 g of sulphur dioxide (SO2) or 10 g of oxygen (O2)?(Atomic masses : S = 32 u ; O = 16 u)
- Which of the following elements has the same molecular mass as its atomic mass ?(a) nitrogen (b) neon (c) oxygen (d) chlorine
- Give the formulae of the compounds formed from the following sets of elements :(a) calcium and fluorine(b) hydrogen and sulphur(c) nitrogen and hydrogen(d) carbon and chlorine(e) sodium and oxygen(f) carbon and oxygen
Kickstart Your Career
Get certified by completing the course
Get Started