Other Chemistry Answers

One sewage treatment plant, bacteria cultures produce 1000 L of methane gas per day at 101.3 K PA pressure. What volume tank would be needed to store one days production at 505.5 K PA

Which of the following reactions is accompanied by an increase in enthalpy? 

1. 2NO(g) + O2(g) → 2NO2(g) + 113 kJ

1. 2H2(g) + O2(g) - 484 kJ ⇌ 2H2O(g)

1. 2SO3(g) ⇌ 2SO2(g) + O2(g)  ∆H = +197 kJ

1. 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g)  ∆H = -111.4 kJ

In a certain reaction ∆H = -136 kJ and Ea = 96 kJ. Which of the following is true of its reverse reaction?

1. The reverse reaction is exothermic and Ea = - 40 kJ.
2. The reverse reaction is exothermic and Ea = 40 kJ. 
3. The reverse reaction is endothermic and Ea = 96 kJ.
4. The reverse reaction is endothermic and Ea = 232 kJ.

1. The specific heat of aluminum is 0.902 J/g•°C. How much heat is absorbed by an aluminum pie tin with a mass of 473 grams to raise its temperature from room temperature (23°C) to oven temperature (190°C)?
2. Stainless steel accessories in cars are usually plated with chromium to give them a shiny surface and to prevent rusting. When 5 grams of chromium at 23°C absorbs 62.5 J of heat, the temperature increases to 50.8°c. What is the specific heat of chromium?
3. If 335 g of water at 65.5°C loses 9,750 J of heat, what is the final temperature of the water?

1. The concentration of sodium chloride, NaCl, in normal blood plasma is about 1.3 mol/L. A certain adult has 3.1L of blood plasma in her body. (6 marks)
2. What amount (in mol) of NaCl is contained in that volume? 
3. What mass of NaCl is contained in that volume?

claculate the volume of 0.015M of HCL solution required to prepare 250ml of 5.25 x 10^-3

1,4 butandiol is an organic alcohol that is made up of 53.3% carbon, 11.2% hydrogen, and 35.5% oxygen. It has a molar mass of 90.14 g/mol

a) what is the empirical formula based on the mass percentage

b) what is the molecular formula for 1,4 butandiol?

225 mL of a 1.45 mol/L solution of sodium iodide is added to 175 mL of a 0.85 mol/L solution of lead(II) nitrate

a) write the balanced chemical equation for this reaction

b) how many grams of solid precipitate will form in the process

c) what is the percent yield if 57.8g of precipitate was collected?

Lactic acid, C3H6O3, is built in human muscles during anaerobic exercises. If the initial concentration of lactic acid is 0.12 mol/L and the pH is 2.39, what is the Ka for the lactic acid?

Discuss the validity of the statement “All polar bonds molecules must have polar bonds and all non polar molecules must have non polar bonds.”