6.57. A sample of an aromatic nitro compound was mixed with hydrochloric acid and methanol, an accurately weighed portion of metallic tin weighing m1 (g) was added and heated. At the same time there was a reaction:

2RNO2+3Sn+12H+=2RNH2+4H2O+3Sn4+

The mass of unreacted tin turned out to be equal to m2 (g). What mass of nitro compounds indicated in the table was contained in the analyzed sample:

Option Compound M, g/mol m1, g m2, g
1 Nitrobenzene C6H5NO2 123.12 0.5225 0.4115
2 Nitrophenol (OH)C6H4NO2 139.11 0.6320 0.4818
3 Nitroaniline H2NC6H4NO2 138.13 0.6117 0.5001
4 Nitrobenzaldehyde C6H4NO2CHO 151.12 0.6002 0.5175

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