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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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1 Answer

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(a) KOH 

(39 +16+1) = 56 g mol–1 

(b) NaHCO3 

23 + 1 + 12 + (3 × 16) = 84 g mol–1 

(c) CaCO

40 + 12 + (3 × 16) = 100 g mol–1 

(d) NaOH 

23+16+1 = 40 g mol–1

(e) C2H5OH = C2 H6

2 × 12 + (6 × 1) + 16 = 46 g mol–1 

(f) NaCl 

23 + 35.5 = 58.5 g mol–1 

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