Some Basic Conc...

Insulin contains $$3.4$$% sulphur. The minimum molecular mass of insulin is :

The molality of 1 L solution with x% $$H_2SO_4$$ is equal to 9. The weight of the solvent present in the solution is 910 g. The value of x in g per 100 mL is :

$$13.4$$ g of a sample of unstable hydrated salt, $$Na_2SO_4.xH_2O$$ was found to contain $$6.3$$ g of $$H_2O$$. The number of molecules of water of crystallisation is :

An experiment was set up to determine the percentage of water absorbed by raisins. If the mass of dry raisins was $$40  g$$ and mass of wet raisins was $$45  g$$, the percent water absorbed would be:

"Suvarnabhasm", an ayurvedic drug, is found to contain $$400$$ ppm of colloidal gold. Mass % of gold (atomic mass of Au $$=197$$ ) will be :

Glucose is a physiological sugar. If the mass percentage of $$C=x\%$$, mass percent of $$H=y\%$$ and mass percent of $$O=z\%$$ in glucose $$(C_6H_{12}O_6)$$, then the value of $$x,\ y$$ and $$z$$ are, respectively:

If $$100$$ mL of $$H_2SO_4$$ and $$100$$ mL of $$H_2O$$ are mixed, the mass percent of $$H_2SO_4$$ in the resulting solution will be: 

Atomic mass of an element is:

Law of conservation of mass was put forward by :

Under the same conditions, two gases have the same number of molecules. They must: