Question 47
Write the formulae for the following and calculate the molecular mass for each one of them

(a) Caustic potash

(b) Baking powder

(c) Lime Stone

(d) Caustic soda

(e) Ethanol
(f) Common salt

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Solution

(a) Caustic potash
$K O H$
$(39 + 16 + 1) = 56 g m o l^{- 1}$

(b) Baking powder
$N a H C O_{3}$
$23 + 1 + 12 + (3 \times 16) = 84 g m o l^{- 1}$

(c) Lime Stone
$C a C O_{3}$
$40 + 12 + (3 \times 16) = 100 g m o l^{- 1}$

(d) Caustic soda
$N a O H$
$23 + 16 + 1 = 40 g m o l^{- 1}$

(e) Ethanol
$C_{2} H_{5} O H$
$2 \times 12 + (5 \times 1) + 16 + 1 = 46 g m o l^{- 1}$

(f) Common salt
$N a C l$
$23 + 35.5 = 58.5 g m o l^{- 1}$

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