43
For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)
- A. 2.24 dm 3
- B. 2.24 cm3
- C. 1. 123
- D. 1. 12dm 3
- E. 4. 48 dm 3
44
20 cm 3 of hydrogen gas are sparked with 20cm 3 of oxygen gas in an endimoeter at 373k (100 oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is
- A. 40 cm 3
- B. 20 cm 3
- C. 30 cm 3
- D. 10cm 3
- E. 5cm 3
45
Sodium chloride may be obtained from brine by
- A. titration
- B. decantation
- C. distillation
- D. evaporation
- E. sublimation