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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


Solution

(a) Caustic potash
KOH
(39+16+1)=56 g mol1

(b) Baking powder
 NaHCO3
23+1+12+(3×16)=84 g mol1

(c) Lime Stone  
CaCO3
40+12+(3×16)=100 g mol1

(d) Caustic soda
NaOH
23+16+1=40 g mol1

(e) Ethanol  
C2H5OH
2×12+(5×1)+16+1=46 g mol1

(f) Common salt 
 NaCl
23+35.5=58.5 g mol1

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