Final answer:
The mass of melamine obtained from 113.0 kg of urea will be 113.0 kg.
Step-by-step explanation:
To find the mass of melamine obtained from 113.0 kg of urea, we first need to calculate the moles of urea using its molar mass. The molar mass of urea (CO(NH2)2) is calculated as: (12.01 g/mol x 1) + (16.00 g/mol x 1) + (14.01 g/mol x 2) = 60.06 g/mol. Therefore, the moles of urea can be calculated as: 113.0 kg x (1000 g/1 kg) / 60.06 g/mol = 1881.03 mol.
From the balanced chemical equation:
CO(NH2)2 + 3HCHO → C3N3(NH2)3 + 3H2O
It can be observed that for every 1 mol of urea, 1 mol of melamine is produced. Therefore, the mass of melamine obtained will be the same as the mass of urea which is 113.0 kg.