Solution b was made by dissolving 40g of sodium carbonate in water and made up to 1 liter find the strength of solution b and percentage of pure sodium carbonate . show me caculation .
or answer me this.
is this right ,mol of solute =mass of solute /molar mass of solution ?

What are the similarities of physical and chemical change ?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .