Atomic mass of an element expressed in grams is called
atomic mass
Molecular mass
Gram atomic mass
Molar mass
A mole of CH4 contains how many grams of molecules?
16 g
18 g
12 g
14 g
The volume occupied by one mole of a gas at S.T.P. is known as
Atomic volume
Molar volume
Gaseous volume
Thermal volume
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 2KClO3 → 2KCl + 3O2↑
3 moles
6 moles
9 moles
12 moles
1 mole of water contains 6.022 × 1023 water molecules and weighs
18g
80g
8g
16g
A gas cylinder of capacity of 20dm3 is filled with gas 'X' the mass of which is 10g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass of the hydrogen is 2 g, hence the relative mass of the gas is
5
10
15
20
The gas law which relates the volume of a gas to the number of molecules of the gas is
Avogadro's law
Gay Lussac's law
Boyle's law
Charle's law
A certain hydrocarbon has the following percentage composition C = 83.72% and H = 16.27%. The vapour density of the compound to be 43. The molecular formula of the compound is
C6H8
C6H6
C6H14
C6H12
The relative molecular mass of a gas or vapour is ___ of its vapour density.
Twice
Half
Thrice
One Third
A molecule of CH4 contains hydrogen atoms of
4
3
2
