Calculate the mass of area \( \left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right) \) required in maki...

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Calculate the mass of area \( \left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right) \) required in making \( 25 \mathrm{~kg} \) of 0.25 molal aqueous solution.
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