Chemistry
The number of molecules in 4.25 g of ammonia is:
(a) 1.0 × 1023
(b) 1.5 × 1023
(c) 2.0 × 1023
(d) 3.5 × 1023
Related Questions
Which of the following weighs the least?
(a) 2 g atom of N
(b) 3 x 1025 atoms of carbon
(c) 1 mole of sulphur
(d) 7 g of silver
Four grams of caustic soda contains:
(a) 6.02 x 1023 atoms of it
(b) 4 g atom of sodium
(c) 6.02 x 1022 molecules
(d) 4 moles of NaOH
A gas cylinder of capacity of 20 dm3 is filled with gas X the mass of which is 10 g. 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 molecular mass of the gas is :
- 5
- 10
- 15
- 20
Twice the vapour density gives:
actual vapour density
relative vapour density
molecular mass
molar volume