Atoms and Molec...

The minimum mass of water needed to slake $$1\ kg$$ of quicklime, assuming no loss by evaporation, is:

What is the definition of relative atomic mass, $$A_{r}$$?

Molecular mass of dry air is ________________.

Cortisone is a molecular substance containing $$21$$ atoms of carbon per molecule. The mass percentage of carbon in cortisone is $$69.98$$%. What is the molecular mass of cortisone?      

The percentage of copper and oxygen in samples of $$CuO$$ obtained by different methods were found to be the same. This illustrates the law of

Which phrase would be incorrect to use:

Which of the following statement (s) is/are correct about the Avogadro's number ?

Pressure of $$1$$g of an ideal gas A at $$27^o$$C is found to be $$2$$ bar. When $$2$$ g of another ideal gas B is introduced in the same flask at same temperature the pressure becomes $$3$$ bar. What is the relationship between their molecular masses?

Equivalent mass of a bivalent metal is $$32.7$$ Molecular mass of its chloride is _____________.

A sample of ozone gas is found to be $$40\%$$ dissociated into oxygen. The average mass of sample should be