Chemistry
Calculate the mass of 0.1 mole of each of the following
(a) CaCO3
(b) Na2SO4.10H2O
(c) CaCl2
(d) Mg
(Ca = 40, Na = 23, Mg =24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
Answer
(a) Mass of 1 mole of CaCO3
= Ca + C + 3O = 40 + 12 + (3 x 16) = 52 + 48 = 100 g
∴ Mass of 0.1 mole of CaCO3 = 0.1 x 100 = 10 g
(b) Mass of 1 mole of Na2SO4.10H2O
= 2Na + S + 4O + 10(2H + O) = (2 x 23) + 32 + (4 x 16) + 10(2 + 16) = 46 + 32 + 64 + 180 = 322 g
∴ Mass of 0.1 mole of Na2SO4.10H2O = 0.1 x 322 = 32.2 g
(c) Mass of 1 mole of CaCl2
= Ca + 2Cl = 40 + (2 x 35.5) = 40 + 71 = 111 g
∴ Mass of 0.1 mole of CaCl2 = 0.1 x 111 = 11.1 g
(d) Mass of 1 mole of Mg = 24 g
∴ Mass of 0.1 mole of Mg = 24 x 0.1 = 2.4 g
Related Questions
Calculate the number of moles of methane in 0.80 g of methane.
Calculate the weight/mass of :
(a) an atom of oxygen
(b) an atom of hydrogen
(c) a molecule of NH3
(d) 1022 atoms of carbon
(e) the molecule of oxygen
(f) 0.25 gram atom of calcium
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3.10H2O.
Calculate the number of gram atoms in 4.6 gram of sodium