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The gas law constant R is given as 0.08206 m3 atm mole-1 K-1. Find its value in: (a) ft 3mm Hg lb-mole-1 K-1 , (b) m3 Pa mole-1 K-1, (c) Joules g-mole-1 K-1. Assume 1 atm. = 760mm Hg = 1.013x105 Nm-2 • Remember 1 joule = 1Nm and in this book, mole is kg mole. ((a) 999 ft 3mm Hg lb-mole-1 K-1 (b) 8313 m3 Pa mole-1 K-1(c) 8.313 J g-mole-1 K-1) 


Identify the stronger acid between each pair.


1. HI and HF

2. HNOand HNO2

3. HBrOand HClO2

Identify the stronger acid between each pair.


1. HI and HF

2. HNO3 and HNO2

3. HBrO2 and HClO2


Buffer solutions:


1. Calculate the pH of a carbonate buffer system that contains 0.0065 M HCO3- and 0.0084 M CO32-. The Ka of HCO3- is 4.7 X 10-11.



A solution is prepared by dissolving 5.00g of NaOH in 150 g of water. What is the molality of the solution?


Buffer solutions:


1. Calculate the pH of a carbonate buffer system that contains 0.0065 M HCO3 and 0.0084 M CO32-. The Ka of HCO3- is 4.7 X 10-11.



1. Calculate the pH of the solution with (H+)= 1.0 x 10-3


2. Calculate the pH of the solution with (H+)= 3.6 x 10-5

Calculate the pH of the following acid or base.


1. 3.6 x 10-7 M HNO3

2. 2.0 x 10-4 M NaOH



In Part A, we saw that the theoretical yield of aluminum oxide is 1.50 mol

mol . Calculate the percent yield if the actual yield of aluminum oxide is 1.23 mol

mol .


0.9 g of solid fuel was burnt in a calorimeter. It was observe that the temperature of 4000 g of water in the calorimeter measured by 3.8°c. The composition of hydrogen in the fuel was 1%. The equivalent weight of water is 385g and the latent heat of steam is 587 Cal/g. Calculate: 1. The high calorific value.

2. Low calorific value.


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