化学题，听不懂！！！！麻烦详细解答！！！！

1 M(尿素)=60

2 N : H = 14 : 4 = 7 : 2

3 (NH4)2SO4：N% = 28/132 = 21.2%

4 28W/132 = 28/60 ；W = 2.2 吨

主要副反应：N2H4+2NaClO= N2↑+2H2O+2NaCl △H<0

3NaClO=" 2NaCl" +NaClO3 △H>0

CO(NH2)2 ＋2NaOH= 2NH3↑+Na2CO3 △H>0

---