Calculate tbe molar mass of the following compounds.(a) Urea (NH2CONH2

1.	Calculate tbe molar mass of the following compounds.(a) Urea (NH2CONH2) (b) Ethanol(C5H5OH); (c) Boric acid (H3BO3)[Atomic mass of N – 14, H – 1, C – 12, B – 11, O – 16]
Answer» (a) Urea (NH₂CONH₂) = 2(14) + 4(1) + 1(16) + 1(12) = 28 + 4 + 16 + 12 = 60 g (b) Ethanol(C₂H₅OH) = 2(12) + 6(1) + 1(16) = 24 + 6 + 16 = 46 g (c) Boric acid (H₂BO₃) = 3(1) + 1(11) + 3(16) = 3 + 11 + 48 = 62 g

Calculate tbe molar mass of the following compounds.(a) Urea (NH2CONH2) (b) Ethanol(C5H5OH); (c) Boric acid (H3BO3)[Atomic mass of N – 14, H – 1, C – 12, B – 11, O – 16]

Answer»

(a) Urea (NH₂CONH₂) = 2(14) + 4(1) + 1(16) + 1(12)

= 28 + 4 + 16 + 12

= 60 g

(b) Ethanol(C₂H₅OH) = 2(12) + 6(1) + 1(16)

= 24 + 6 + 16

= 46 g

(c) Boric acid (H₂BO₃) = 3(1) + 1(11) + 3(16)

= 3 + 11 + 48

= 62 g