Chemistry
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
Related Questions
MnO2 + 4HCl ⟶ MnCl2 + 2H2O + Cl2
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate:
(a) mass of MnO2 used
(b) moles of salt formed,
(c) mass of salt formed,
(d) moles of chlorine gas formed,
(e) mass of chlorine gas formed,
(f) volume of chlorine gas formed at S.T.P.,
(g) moles of acid required,
(h) Mass of acid required.
Nitrogen and hydrogen react to form ammonia.
N2 (g) + 3H2 (g) ⟶ 2NH3 (g)
If 1000 g of H2 react with 2000 g of N2:
(a) Will any of the two reactants remain unreacted? If yes, which one and what will be it's mass?
(b) Calculate the mass of ammonia (NH3) that will be formed?
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
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