If hardness of water sample is `200 parts per million`, Calculate the mass ratio of CaCO3 to water is:

Define Parts per million

Calculate number of moles in 36g of water.

Calculate number of atoms in 0.05g of water .

Calculate the total number of atoms in 18g of water.

Calculate the actual mass of a water molecule in gram?

In a solution of common salt in water, the ratio of salt to water was 30 :70 as per weight. If we evaporate 100 grams of water from one kilogram of this solution, what will be the ratio of the salt to water by weight?

What is the ratio by mass of H and O in water ?

Calculate the relative molecular masses of : Water (H_2O)