Answer :

(a) Sodium Chloride


Moles = Mass of subtance in grams /Molecular Mass(in g/mol)


Molecular mass of NaCl = 1× (Atomic mass of Na) + 1× (Atomics mass of Cl)


= 1× (23) + 1× (35.5)


= 55.5


Mole = 0.2 mol(given)


0.2 = given mass/55.5


Given mass = 0.2× 55.5


= 11.1g


(b) Magnesium Oxide


Moles = Mass of subtance in grams /Molecular Mass(in g/mol)


Molecular mass of MgO = 1× (Atomic mass of Mg) + 1× (Atomics mass of O)


= 1× (24) + 1× (16)


= 40


Mole = 0.2 mol(given)


0.2 = given mass/40


Given mass = 0.2× 40


= 8g


(c) Calcium Carbonate


Moles = Mass of subtance in grams /Molecular Mass(in g/mol)


Molecular mass of CaCO3 = 1× (Atomic mass of Ca) + 1× (Atomics mass of C) + 3× (atomic mass of O)


= 1× (40) + 1× (12) + 3× (16)


= 100


Mole = 0.2 mol(given)


0.2 = given mass/100


Given mass = 0.2× 100


= 20g


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