24. Solid ammonium dichromate decomposes as under: NH42Cr2O7→N2+Cr2O3+4H2O If 63 g of ammonium dichromate decomposes. Calculate: a the quantity in moles of NH42Cr2O7b the quantity in moles of nitrogen formedc the volume of N2 evolved at STP.d what will be the loss of mass?e calculate the mass of chromium III oxide formed at the same time.
Question:9
MnO2 + 4HCl MnCl2+ 2H2O + Cl2
1.746g of pure MnO2 is heated strongly with conc. HCl. Calculate:
a) Moles of MnO2 used.
b) Mass of salt formed.
c) Moles of chlorine gas formed.
d) Volume of chlorine gas formed at STP.
e) Mass of acid required.
15. Indium (atomic weight = 114.82) has two naturally occurring isotopes, the predominant one form has isotopic weight 114.9041 and abundance of 95.72%. Which of the following isotopic weights is the most likely for the other isotope?
(A) 112.94
(B) 115.90
(C) 113.90
(D) 114.90
Q. The number of
i) molecules [S = 32]
ii) atoms in 192 g. of sulphur. []
24. Solid ammonium dichromate decomposes as under:
If 63 g of ammonium dichromate decomposes. Calculate:
1) Avagadro's Law.
2) Gay Lussac's Law.
3) Boyle's Law.
4) Charle's Law.