A given sample of pure compound contains `9.81 g` of Zn, `1.8xx10^(23)` atoms of chromium, and `0.60` mol of oxygen atoms. What is the simplest formula?

A compound used in making nylon, contains 43.8% oxygen. There are four oxygen atoms per molecule. What is the molecular mass of compound ?

A 1.0g sample of a pure organic compound cotaining chlorine is fused with Na_(2)O_(2) to convert chlorine to NaCl. The sample is then dissolved in water, and the chloride precipitated with AgNO_(3) , giving 1.96 g of AgCl. If the molecular mass of organic compound is 147, how many chlorine does each molecule contain ?

A sample of paramagnetic salt contains 2.0 xx 10^24 atomic dipoles each of dipole moment 1.5 xx 10^-23 JT^-1 . The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law)

A high altitude balloon contains 6.81 g of helium in 1.16xx10^(4)" L at"-23^(@)C. Assuming ideal gas behaviour, how many grams of helium would have to be added to increase the pressure to 4.0xx10^(-3) atm?

Silver oxide (Ag_2O) decomposes at temperature 300^@C yielding matellic silver and oxygen gas. A 1.60g sample of impure silver oxide yields 0.104g of oxygen gas. What is the per cent by mass of the silver oxide in the sample ?

Mass of one atom of the element A is 3.9854 xx 10^(-23)g . How many atoms are contained in 1g of the element A ?

Gas molecules each of mass 10^(-26) kg are taken in a container of volume 1 dm^(3) . The root mean square speed of gas molecules is 1 km sec^(-1) .What is the temperature fo gas molecules. (Given : N_(A) =6xx10^(23),R=8J//mol.K )

In Bohr model of hydrogen atom , the electron circulates around the nucelus in a path of raidus 5.1 xx 10^-11 m at a frequency of 6.8 xx 10^15Hz . What is the value of magnetic field set up at the centre of the orbit?

200 cm^3 of an aqueous solution of a protein contains 1.26g of the protein . The osmotic pressure of such a solution at 300K is found to be 2.7 xx 10^-3 bar. Calculate the molar mass of the protein (R=0.083 L bar mol^-1 K^-1 )