An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20% by weight?
20 g of oxygen combine with metal = 80 g
∴By definition, equivalent wt. of metal=32.
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
500 mL of NH3 contain molecules at S.T.P. How many molecules are present in 100 mL of CO2 at S.T.P.?
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
A metal M of equivalent mass E forms an oxide of molecular formulaMxOy. The atomic mass of the metal is given by the correct equation
Which of the following methods of expressing concentration are independent of temperature?
Pressure is determined as force per unit area of the surface. The S.I unit of pressure, pascal, is as shown below:
1Pa = 1 Nm–2
If mass of air at sea level is 1034g cm-2, calculate the pressure in pascal.
Determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is (Atomic mass: Fe = 55.85, O = 16.00 amu)