The following are the molecular masses:
The molecular mass of H2 – 2 x atoms atomic mass of H = 2 x 1u = 2u
The molecular mass of O2 – 2 x atoms atomic mass of O = 2 x 16u = 32u
The molecular mass of Cl2 – 2 x atoms atomic mass of Cl = 2 x 35.5u = 71u
The molecular mass of CO2 - atomic mass of C + 2 x atomic mass of O = 12 + ( 2x16)u = 44u
The molecular mass of CH4 - atomic mass of C + 4 x atomic mass of H = 12 + ( 4 x 1)u = 16u
The molecular mass of C2H6- 2 x atomic mass of C + 6 x atomic mass of H = (2 x 12) + (6 x 1)u=24+6=30u
The molecular mass of C2H4- 2 x atomic mass of C + 4 x atomic mass of H = (2x 12) + (4 x 1)u=24+4=28u
The molecular mass of NH3- atomic mass of N + 3 x atomic mass of H = (14 +3 x 1)u= 17u
The molecular mass of CH3OH - atomic mass of C + 3x atomic mass of H + atomic mass of O + atomic mass of H = (12 + 3x1+16+1)u=(12+3+17)u = 32u
Answered by Shivani Kumari | 2 years agoCalculate the number of aluminium ions present in 0.051g of aluminium oxide.
(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27u)
Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur.
What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?
Convert into mole.
(a) 12g of oxygen gas
(b) 20g of water
(c) 22g of carbon dioxide
What is the mass of -
(a) 1 mole of nitrogen atoms?
(b) 4 moles of aluminium atoms((Atomic mass of aluminium =27)?
(c) 10 moles of sodium sulphite (Na2SO3)?