solve all questions of 7. and 8. for 50 points with explanation
Answers
Answer:
7. a) This Atomic weight is the weight of 1 mole of atoms of that kind. For instance look at N (Nitrogen), you will see the atomic mass is 14.00674 grams. So that means if you had 1 mole of nitrogen atoms, it would weight, 14.00674 grams.
b) Mass of 1 mole of aluminium atoms = 27 g. Mass of 4 moles of aluminium atoms = (27 x 4) = 108 g.
c) Mass of 10 moles of sodium sulphite is 1260 grams. So, the mass of 10 moles of sodium sulphite is 1260 grams.
8. a) Molar mass of O2 = 2 x 16 = 32 g
Number of moles in 12g O2 = Given mass/ Molar mass = 12/32 = 0.375 mole
(b) Molar mass of H2O = 2 x 1 + 16 = 18g
Number of moles in 20 g H2O = 20/18 = 1.11mole
(c) Molar mass of CO2 = 12 + 16 x 2 = 12 + 32 = 44g
Number of moles in 22g CO2 = 22/44 = 0.5mole
Answer:
7. a) This Atomic weight is the weight of 1 mole of atoms of that kind. For instance look at N (Nitrogen), you will see the atomic mass is 14.00674 grams. So that means if you had 1 mole of nitrogen atoms, it would weight, 14.00674 grams.
b) Mass of 1 mole of aluminium atoms = 27 g. Mass of 4 moles of aluminium atoms = (27 x 4) = 108 g.
c) Mass of 10 moles of sodium sulphite is 1260 grams. So, the mass of 10 moles of sodium sulphite is 1260 grams.
8. a) Molar mass of O2 = 2 x 16 = 32 g
Number of moles in 12g O2 = Given mass/ Molar mass = 12/32 = 0.375 mole
(b) Molar mass of H2O = 2 x 1 + 16 = 18g
Number of moles in 20 g H2O = 20/18 = 1.11mole
(c) Molar mass of CO2 = 12 + 16 x 2 = 12 + 32 = 44g
Number of moles in 22g CO2 = 22/44 = 0.5mole