Which law explains Gay-Lussac's law?
Charles
Boyle
Avogadro
Hunds
3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atom in the solution are
6.68 × 1023
6.09 × 1022
6.022 × 1023
6.022 × 1021
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
Which of the following has maximum number of atoms?
18 g H2O
18 g of O2
18 g of CO2
18 g of CH4
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 relative molecular mass of a gas or vapour is ___ of its vapour density.
Twice
Half
Thrice
One Third
How many times on atom of sulphur is heavier than an atom of carbon?
32 times
12 times
8/3 times
12/32 times
Which number is defined as the number of atoms present in 12g of C-12 isotope?
Avogadro's
Faraday's
Coulumb's
Dalton's
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
