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
Atomic mass of an element expressed in grams is called
atomic mass
Molecular mass
Gram atomic mass
Molar mass
A molecule of CH4 contains hydrogen atoms of
4
3
2
5
A sample of CaCO3 contain 3.01 × 1023 ions of Ca2+ and CO32-. The mass of the sample is
100 g
50 g
200 g
5 g
Which law explains Gay-Lussac's law?
Charles
Boyle
Avogadro
Hunds
The relative molecular mass of Na2S2O3.5H2O is
250 a.m.u.
250 g
248 a.m.u.
248 g
How many times on atom of sulphur is heavier than an atom of carbon?
32 times
12 times
8/3 times
12/32 times
Sulphur is molecule is composed of eight similar atoms hence it is
Diatomic
Octatomic
Decatomic
Deciatomic
Inert gases are
Reactive
Corrosive
Malleable
Monoatomic
A mole of CH4 contains how many grams of molecules?
16 g
18 g
12 g
14 g
