General Chemistry Answers

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. HNO₃ and HNO₂

3. HBrO₂ and 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 CO₃^2-. The K_a of HCO^3- 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.