A fIask P contains 0.5 mole of oxygen gas. Another flask Q contains 0.4 mole of ozone gas. Which of the two flask contains greater number of oxygen atoms?

Which of the following contains the greatest number of oxygen atoms?

Two flasks ' A' and ' B ' have equal volumes. Flask ' A ' contains 'H_2' and is maintained at '300 K' while 'B' contains equal mass of 'CH_4' gas and is maintained at '600 K'. i. Which flask contains greater number of molecules? How many times more? ii. In which flask pressure is greater? How many times more? iii. In which flask molecules are moving faster? iv. In which flask the number of collisions with walls are greater?

How many moles of magnesium phosphate 'Mg_3(PO_4)_2' will contain 0.25 mole of oxygen atom?

A gaseous oxide contains 30.4% of nitrogen, one molecule of which contains one nitrogen atom. The density of the oxide relative to oxygen is

One mole of an element contains 6.022xx10^23 atoms. find the number of oxygen atoms in 4 g of O_2 .