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燃烧热的测定 PowerPoint PPT Presentation


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燃烧热的测定. 实验目的. 1. 用氧弹量热计测定萘的燃烧热。 2. 明确燃烧热的定义,了解恒压燃烧热和恒容燃烧热的差别。 3. 了解量热计中主要部分的作用,掌握氧弹量热计的实验技术。 4. 学会雷诺图解法校正温度改变值。. 实验原理. 1. 燃烧热. 1mol 物质完全氧化时的反应热称为燃烧热。. 在恒压条件下测定的燃烧热称为恒压燃烧热 Qp(=  H ) ;在恒容条件下测定的燃烧热称为恒容燃烧热 Qv(=  U ) 。.  H=  U+  (pV). 若把参加反应的气体和反应生成的气体作为理想气体处理,则有下列关系式:.

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燃烧热的测定

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4972267


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1mol

Qp(= H )Qv(= U )

H=U+(pV)

QP=QV+nRT

n


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B(g)

2.


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W1T


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-26.460kJg-1-6.695kJg-1

qvkJ/g, QV,m= qvMr


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3.


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1

1

1

1

1000ml 1

1

A.R.

A.R.


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(1)

(2)

(3)

(4)

2.


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150.6-0.8

(1).


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  • (2)


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3

0.5MPa201.2 MPa


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(4)

30001103010


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0.6

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  • 1-26460Jg -1-6.695kJg-1

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  • 15ml.HNO3150ml0.100moldm-3NaOH5.98J


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20.51.0 mm

3


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