For the decomposition of nitramide in aqueous solution at 25C NH2NO2(aq) right arrow N2O(g) + H2O(l)
The following data have been obtained:
[NH2NO2],M 0.978 0.476 0.232 0.113
time, min 0 255 510 765
The average rate of disappearance of NH2NO2 over the time period from t = 0 min to t = 207 min isM min-1.

0.001968 M min-1

Explanation:

NH2NO2(aq) --> N2O(g) + H2O(l)

[NH2NO2],M       0.978 0.476 0.232    0.113

time, min              0          255     510      765

The average rate of disappearance over the time period form t = 0 min to t = 255 min is given as;

Average rate = Change in concentration / time taken

Change in concentration = Final Concentration - Initial concentration

Change = 0.476 - 0.978 = 0.502

time taken = 255min - 0min = 255 min

Average rate = 0.502 / 255 = 0.001968 M min-1

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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