Atoms and Molec...

Insulin contains 3.4% sulphur by mass. What will be minimum molecular weight of insulin?

The number of molecule in $$4.25$$g of $$NH_3$$ is:

A compound contains $$10^{-2}\%$$ of phosphorus. If the atomic mass of P is $$31$$, then the molecular mass of the compound having one phosphorous atom per molecule is:

The Avogadro number ($$N_A$$), is changed from $$6.022\times 10^{23}$$ $$mol^{-1}$$ to $$6.022\times 10^{20}$$ $$mol^{-1}$$, this would change:

A sample of potato starch was ground in a ball mill to give a starch-like molecule of lower molecular weight. The product analysed was 0.086 % phosphorus. If each molecule is assumed to contain one atom of phosphorus, what is the molecular mass of the material?

A compound contains $$4$$% oxygen, then the minimum molecular weight of that compound will be:

The number of atoms of the $$He$$ in $$104\ amu$$ is:

The number of atoms of oxygen present in 10.6 g of $$Na_2CO_3$$ will be:

Which of the following is correct increasing order of molecular mass?

If $$x \ g$$ of an element $$A$$ contains $$\cfrac y{80}$$ atoms and $$2x \ g$$ of an element $$B$$ contains $$\cfrac y{40}$$ atoms then the ratio of atomic weights of two elements $$A$$ and $$B$$ is: