QUESTION 18 Which of the following has the highest heat of combustion per CH,?

What is the enthalpy change when 49.4mL of .430 M sulfuric acid reacts with 23.3 mL of .309 M potassium hydroxide

A hydrated barium hydroxide compound is heated to remove all the water of hydration.  The mass of the compound before heating was 15.6 g and after heating the mass was recorded as 8.75 g.  a)  Determine the chemical formula of the hydrate. b)  The chemist who performed the experiment was concerned about how long to heat the hydrated crystal.  The compound is known to be barium hydroxide octahydrate.  In the experiment above, is it more likely that the hydrate was heated slightly too long (or perhaps at too high a heat) or not long enough?  Explain your choice.

Gasoline is composed of a variety of different liquid hydrocarbons, which do not separate as time passes. Gasoline is an example of a: A) heterogeneous mixture B) Chemical compound C) Chemical element D) Solution

What are other examples of combustion in the human body?

Question 3 Bethany needs to measure out a certain amount of Cuso, for a lab experiment. The proced- ure only gives her the amount in moles. What should she use to calculate the amount of grams of Cuso. needed?

Name (please print): Heat Capacity of an Unknown Metal Post Lab Questions 1.) When determining the heat capacity of the unknown metal we assumed the heat capacity of the water has a value of 4.186J/g®C. Is there an error(s) in making this error? Explain The possibility of error in the experiment can be loss of heat, the thermometer not being precise enough to give accurate values, and the capacity of the thermometer is being ignored 2.) What is the heat energy needed to raise the temperature of 6.63moles of ethanol CH;CH;OH from a temperature of 2.33°C to 17,5°C. [CH;CH;OH=46.07g/mol) [Ccusch2ow-2,46J/g°C] 3.) What is the identity of an unknown metal that absorbs 0.589KJ of heat energy where the metal is heated from 33.6°C to 241.6°C. The mass of the metal is 13.48g. [Cr= 0.160 J/g°C] [Cs»= 0.210 J/g°C] [Cc. = 0.385 J/g°C][Cz» = 0_390 J/g*C] 4.) How much encrgy is liberated when 600.2g of O, is reacted with propane in a combustion tank. Assume the following: C,Hg) + 50;(g) – 3C0;(g)+…

What general form of energy is initially in your gas tank? What form of energy is it converted to when the car is moving?

Considering the amount of energy absorbed or released, what type of reaction occurs when gasoline is consumed in a car?

Acetylene (C,H,) gas is often used in welding torches because of the very high heat produced when it reacts with oxygen (O. gas, producing carbon dioxide gas and water vapor. Calculate the moles of acetylene needed to produce 1.50 mol of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits. olo &