1.

Complete the table Element/Compound Chemical formula Molecular massHydrogenOxygenNitrogenWaterAmmoniaH2O2N2H2ONH3 1 + 1 = 2 ....... .......1 + 1 + 16 = 18 ........Calculate the molecular mass of glucose (C6H12O6) and sulphuric acid (H2SO4)

Answer»
 Element/Compound Chemical formula Molecular mass
Hydrogen
Oxygen
Nitrogen
Water
Ammonia
H2
O2
N2
H2O
NH3
 1 + 1 = 2
 16 + 16 = 32
 14 + 14  = 28
1 + 1 + 16 = 18
 14 + 1 + 1 + 1 = 17

Molecular mass of glucose 

= 6 × 12 + 12 × 1 + 6 × 16 = 72 + 12 + 96 = 180 g 

Molecular mass of sulphuric acid 

2 × 1+ 1 × 32 + 4 × 16 = 2 + 32 + 64 = 98 g



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