How many moles of electron weighs one kilogram?
6.023 × 1023
Mass of an electron
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)
A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is
The total number of electrons in one molecule of carbon dioxide is
The largest number of molecules is in
When the same amount of zinc is treated separately with excess ofsulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is
2.76 g of silver carbonate on being strongly heated yields a residue weighing
If 0.50 mole of BaCl2 is mixed with 0.20 mole of Na3PO4, the maximum number of moles of Ba3 (PO4)2 that can be formed is
Which has maximum number of atoms?