参考答案:解:根据题意得天然气的视分子量:
M=∑yіMі(15%)
=0.955 x16 +0.015 x30 +0.005 x44 +0.015 x28 +0.010 x44(10%)
=15.28 +0.45 +0.22 +0.42 +0.44
=16.81(5%)
天然气的视密度:
ρ=∑yіρі(15%)
=0.955 x0.72 +0.015 x1.36 +0.005 x2.01 +0.015 x1.25 +0.010 x1.98(10%)
=0.6876 +0.0204 +0.01005 +0.01875 +0.0198
=0.7566kg/m3(5%)
天然气的相对密度:S=ρ÷1.293(15%)=0.7566 ÷1.293(5%)=0.585<(5%)[或s=M÷28.964(15%)=16.81 ÷28.964(5%)=0.58(5%)]
答:天然气的视分子量为1681(5%),视密度为0.7566kg/m3)(5%),相对密度为0.585(5%)。
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