Atoms and Molec...

Who gave the definition of an element? 

$$12$$ gm of an alkaline earth metal gives $$14.8$$g of its nitride. The atomic mass of metal is:

A compound was found to contain $$5.37\%$$ nitrogen by mass. What is the minimum molecular weight of compound?

A compound possesses 8% sulphur by mass. The least molecular mass is 

48 g of Mg contain the same number of atoms as 160 g another mono-atomic element.The atomic mass the element is:

A sample of pure carbon dioxide, irrespective of its source contains $$27.27 \%$$ carbon and $$72.73 \%$$ oxygen. The given data supports: 

In $$\overset { 14 }{ \underset { 7 }{ N }  } $$ if mass attributed to electron were doubled & the mass attributed to protons were halved, the atomic mass would become approximately:-

If Avagadro Number $${N}_{A}$$ is changed from $$6.022\times{10}^{23}{mol}^{-1}$$ to $$6.022\times{10}^{20}{mol}^{-1}$$ this would change

The weight of a molecule of compound $${C_{60}}{H_{22}}$$ is 

Iron forms two oxides, in first oxide $$56$$ grams of Iron is found to be combined with $$16$$ gram oxygen and in second oxide $$112$$ gram of Iron is found to be combined with $$48$$ gram oxygen. This data satisfy the law of