what mass of N2H4 can be oxidised to N2 by 24 g of K2Cr2O7 which is reduced to Cr(OH)4 -
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Explanation:
The oxidation number of chromium changes from +6 to +3.
The oxidation number of each N atom changes from −2 to 0.
Net increase in the oxidation number of two N atoms in hydrazine =4.
Thus, 3 moles of hydrazine =4 moles of K2CrO .
Molar mass of hydrazine is 32 g/mol.
Molar mass of potassium chromate is 194.19 g/mol.
The mass of hydrazine that can be oxidized is 43 × 194.19g/mol 24.0g ×32g/mol=2.969g=3g.
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