The average density of the universe as a whole is estimated as `3 xx 10^(-29)g//m` L . If we assume that the entire mass is only H atoms, what is the average volume of space that contains one H atom?

The mass of a single atom of an element M is 3.15 xx 10^(-23) g . What is its atomic mass ? What could the element be ?

A gaseous mixture contains 40% H_(2) and 60% He, by volume. What is the average molecular mass of mixture ?

2.49 xx 10^(-18)g of an element X contains 2.0 xx 10^(4) atoms. What is the atomic mass of the element X ?

The circumference of the first Bohr orbit in H atom is 3.322 xx 10^(-10) m .What of the electron of this orbit ?

The circumference of the first Bohr orbit in H atom is 3.322 xx 10^(-10) m .What is the velocity of the electron of this orbit ?

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number-A is given by (1.25xx10^(-13)) cm. Radius of atom is one A. If the mass number is 64 then the fraction of the atomic volume that is occupied by the nucleus is

The average mass of one gold atom in a sample of naturally occuring gold is 3.2707xx10^(-22) g . Use this to calculate the molar mass of gold.

The average mass of one gold atom in a sample of naturally occuring gold is 3.2707xx10^(-22) g . Use this to calculate the molar mass of gold.