Some Basic Conc...

Barium chloride reacts with sodium sulfate to form barium sulfate and sodium chloride. Then, according to the law of conservation of mass:

A balanced chemical equation  supports

If 11 g of oxalic acid are dissolved in 500 mL of solution (density = 1.1 g mL$$^{-1}$$), what is the mass % of oxalic acid in solution?

8 g of a solute is dissolved in 92 g of solvent. If the density of solution is 2 g ml$$^{-1}$$, find the weight-volume percentage.

Solubility of a solute is $$S$$. Find its percentage by weight.

Nitrogen reaction with oxygen to form nitrous oxide.

A solution with a weight percentage of sodium hydroxide of 9% is prepared by adding the following mass of water (in grams) to 300 grams of that solution with a weight percent of $$NaOH$$ of 15%.

How many mL of sulphuric acid of density 1.84 g mL$$^{-1}$$ containing 95.6 mass % of $$H_2SO_4$$ should be added to one litre of 40 mass % solution of $$H_2SO_4$$ of density 1.31 g mL$$^{-1}$$ in order to prepare 50 mass % solution of sulphuric acid of density 1.40 g mL$$^{-1}$$?

A student has only 200 g of valuable solvent and wishes to make a solution of 20% by weight from solute $$A$$. How many grams of $$A$$ is weighed out?

Calculate the number of iron atoms in a piece of iron weighing $$2.8 g$$. (Atomic mass of iron $$=56$$)