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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

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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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