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we know that in the case of compounds –

Molecular mass of water (H₂O) = (2 + 16 ) = 18 grams

Molecular mass of ammonia (NH₃) = ( 14+3) = 17 grams

Molecular mass of glucose ( C₆H₁₂O₆) = ( 72 + 12+ 96) = 180 grams

Applying the above formula to all 3 cases-

(i) Mass = 5 x 18 = 90 grams

(ii) Mass = 2 x 17 = 34 grams

(iii) Mass = 2 x 180 = 360 grams