The mole concept based problem in chemistry for IIT-JEE and NEET- problem and answer set-1

 
Problem:1   A small piece of copper(Cu ) weighs 0.635 gm. How many atoms of copper(Cu) does it contain?

Problem:2    The ethane gas molecule of weight around 5 gm are confined in cylinderical bulb of 1 litre capacity. These cylinderical bulb is so weak in nature, it will burst if the pressure exceeds more than 10 ATM. Calculate the bursting temperature of cylinder at which the pressure reach its maximum.

Problem:3   A gas molecule occupies in the volume of 300 ml at the temperature of 27 C and 730 mm pressure. Calculate its volume at standard temperature and pressure.

Problem:4   Estimate the weight in gm of 12.044 x 10 23 atoms of carbon.

Problem:5    10 21 molecules of  CO2 removed from 200 mg of the same gas. How many moles of CO2 left in the gas cylinder?

Problem:6    Estimate the number of sulphate ions in 100 ml of volume with the concentration of 0.001 M  sulphuric acid solution.

Problem:7. Calculate the number oxygen atoms present in 50 gm of CaCO3.

Problem:8. The atomic weight of two elements from periodic table, A and B are 20 and 40 respectively. If 'x' gm of A element contains 'y' atoms. Calculate number of atoms present in '2x' gm of B.

Problem:9   A volume of 95 ml N2O at  the temperature of 27 C is collected in graduated tube over Hg. The level of Hg inside the tube being 60 mm above the outside Hg level when barometer reads 750 mm,

( a) Calculate the volume of the gas at standard temperature and pressure.

( b ) calculate the volume of gas at the temperature of 40 C , when the barometric pressure being 745 mm of Hg and the level of Hg inside the tube is 25 mm below the outside level.

Problem:10   The round bottom flask is designed as one litre capacity. What is the volume of air will move out from this flask, if it is heated from the temperature of 27 C to 37 C? Assume the pressure is constant in this entire process