Worksheet: Enthalpy Measurements

In this worksheet, we will practice using calorimetry data to determine enthalpy changes during phase changes and chemical reactions.

Q1:

What is the standard enthalpy change for the following reaction? BH()+6HO()2B(OH)()+6H()26232glsg

Substance B H ( ) 2 6 g H O ( ) 2 l B ( O H ) ( ) 3 s H ( ) 2 g
Δ 𝐻 f ( k J / m o l ) 36.4 2 8 5 . 8 3 1 , 0 9 4 . 3 3 0

Q2:

What is the standard enthalpy change for the following reaction? BCl()+3HO()B(OH)()+3HCl()323glsg

Substance B C l ( ) 3 g H O ( ) 2 l B ( O H ) ( ) 3 s H C l ( ) g
Δ 𝐻 f ( k J / m o l ) 4 0 3 . 8 2 8 5 . 8 3 1 , 0 9 4 . 3 3 9 2 . 3 0 7

Q3:

What is the standard enthalpy change for the following reaction? BF()+3HO()B(OH)()+3HF()323glsg

Substance B F ( ) 3 g H O ( ) 2 l B ( O H ) ( ) 3 s H F ( ) g
Δ 𝐻 f ( k J / m o l ) 1 , 1 3 6 . 0 2 8 5 . 8 3 1 , 0 9 4 . 3 3 2 7 3 . 3

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