Calculate the mass of nitrogen supplied to the soil by 5Kg of urea [CO(NH₂)₂]?

20 mL solution of 0.1 M ferrous sulphate was completely oxidised using a suitable oxidising agent. What is the number of electrons exchanged?

• 1.204 x 10²²

• 193

• 1930

• 1.204 x 10²¹

233.

Calculate the molar mass of the following:
H₂O

Calculate the molar mass of the following:
CO₂

Calculate the molar mass of the following:
CH₄

Calculate the molecular mass of glucose (C₆H₁₂O₆) molecule.

Calculate the gram molecular mass of sugar (C₁₂H₂₂O₁₁).

How much copper can be obtained from 100 g of copper sulphate (CuSO₄)? 

Explain the term 'mole'?

What is the utility of mole concept?