500 mL of NH3 contain  molecules At S.T.P. How Many Molecules Are Present In 100 mL of CO2 at S.T.P.? 

An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of the alkaloid is

If 30mL H₂ and 20mL of O₂ react to form water, what is left at the end of the reaction? 

How many moles of magnesium phosphate, Mg₃(PO₄)₂ will contain 0.25 mole of oxygen atoms?

The decomposition of a certain mass CaCO₃ gave 11.2 dm³ of CO₂ gas at STP. The mass of KOH required to completely neutralize the gas is 

1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of the metal is 

The number of g-atom of oxygen in  CO molecules is

In the reaction, 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O,

when one mole of ammonia and one mole of oxygen are made to react to completion, then

An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20% by weight? 

A metal M of equivalent mass E forms an oxide of molecular formulaM_xO_y. The atomic mass of the metal is given by the correct equation

Which of the following methods of expressing concentration are independent of temperature?