由硝酸铵和硫酸铵混合成的氮肥1.06g,与足量熟石灰粉末混合加热,在标准状况下得到336mL氨气,则混合物中硝酸铵的质量
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设硝酸铵为x克,硫酸铵为1.06-x克.

2NH4NO3 + Ca(OH)2 ==== 2NH3(g) + Ca(NO3)2 + 2H2O

x g

x/80 mol x/80 mol

(NH4)2SO4 + Ca(OH)2 ==== 2NH3(g) + CaSO4 + 2H2O

1-x g

(1-x)/132 mol 2(1-x)/132 mol

336mL (0.336L) NH3物质的量:0.336/22.4 = 0.015 mol

x/80 + 2(1-x)/132 = 0.015

解得 x = 0.40 g

混合物中硝酸铵的质量分数为:0.4/1.06 = 0.377 = 37.7%