(a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ?
(b) Calculate he formula masses of the following compounds (i) Calcium chloride
(ii) Sodium carbonate
(Given Atomic masses Ca = 40 u ; Cl = 35.5 u ; Na = 23 u ; C = 12 u ; O = 16 u)
Answers
Answer:
A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound
Explanation:
( i) Nacl and Mgcl2
(b) (i) 110.98 g/mol
(ii)105.9888 g/mol
Explanation:
(a) ‘Formula Unit’ of an ionic compound is defined as the covalent or ionic molecule’s empirical formula. In simpler terms, the simpler ionic combination that creates a neutral unit that is electric is called the formula unit. (i) The formula unit of sodium chloride is NaCl; (ii) Formula unit of magnesium chloride is MgCl2.
(b) Calculating the formula masses:
(i) Formula Mass of CaCl2 = mass of atomic Calcium + mass of two chlorine atoms .
= 1xCa + 2xCl = (40+71) u = 111 u
(ii) Formula Mass of Na2CO3 = mass of two Na atoms + mass of atomic carbon + mass of three Oxygen atoms .
= 2xNa + 1xC + 3xO= (2x23 + 1x12 + 3x16) u = 106 u .
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