Question

1. (a) (i) what are exotic breeds? (ii) state three advantages of exotic breeds of poultry. (b) (i) define relative - atomic mass. (ii) calculate the molar mass of each of the following compounds: (a) na₂co₃ (β) ch₃cooh na = 23, o = 16, c = 12, h = 1 (c) (i) name two organisms commonly used in biotechnology. (ii) give one example of an industry which uses each of the organisms named in (i). (d) (i) list three other sources of electric power generation apart from hydro and thermal sources. (ii) state the energy transformation that takes place in any two of the listed sources.

Explanation:

Step1: Calculate molar mass of $Na_2CO_3$

The molar mass of a compound is the sum of the molar masses of its constituent elements. For $Na_2CO_3$, there are 2 Na atoms, 1 C atom and 3 O atoms.
$M(Na_2CO_3)=2\times M(Na)+M(C)+3\times M(O)$
$M(Na) = 23g/mol$, $M(C)=12g/mol$, $M(O) = 16g/mol$
$M(Na_2CO_3)=2\times23 + 12+3\times16$
$=46 + 12+48$
$=106g/mol$

Step2: Calculate molar mass of $CH_3COOH$

For $CH_3COOH$, there are 2 C atoms, 4 H atoms and 2 O atoms.
$M(CH_3COOH)=2\times M(C)+4\times M(H)+2\times M(O)$
$M(C) = 12g/mol$, $M(H)=1g/mol$, $M(O) = 16g/mol$
$M(CH_3COOH)=2\times12+4\times1 + 2\times16$
$=24 + 4+32$
$=60g/mol$

Answer:

(i) The molar mass of $Na_2CO_3$ is $106g/mol$.
(ii) The molar mass of $CH_3COOH$ is $60g/mol$.