Calculate the number of moles of urea present in 5.6 g of urea.​

22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution. (Given : Molar mass of urea = 60 gram mol^(-1) )

Calculate the number of moles of water (H_(2)O) present in 4.5 g of water.

A sample of iron has a mass of 1.68 g. Calculate (a) the number of moles of iron present, (6) the number of atoms of iron in the sample

Calculate the number of moles of sodium (Na) atoms present in 11.5 g of sodium.

The number of H-atoms present in 5.6g urea are :-

An enzyme contains 5.6 % Fe, calculate number of Fe atoms present in 1 g of enzyme.

The number of nitrogen atoms present in the monomer of urea-formaldehyde resin is__________