Near a volcano you would find?

The value of ΔH for the reaction below is -72 kJ. __________ kJ of heat are released when 1.0 mol of HBr is formed in this react

eimsori [14]

Answer:

36 KJ of heat are released when 1.0 mole of HBr is formed.

Explanation:

By Hess law,

The heat of any reaction ΔH for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction:

H 2 (g) + Br 2 (g) → 2HBr (g) ΔH = -72 KJ

This is the energy released when 2 moles of HBr is formed from one mole each of H2 and Br2.

Therefore, Heat released for the formation of 1 mol HBr would be half of this.

Hence,

ΔHreq = -36 kJ

36 KJ of heat are released when 1.0 mole of HBr is formed.

4 0

3 years ago

) Predict the product for the following reaction sequence. A) 2,2-dimethylpropanoic acid B) 3,3-dimethyl-2-butanone C) 2,2-dimet

cestrela7 [59]

Answer:

Option C. 2,2-dimethyl-1-propanol

Explanation:

The first attached picture, is the initial reactant.

Now, what happens in each step?, at first we have an alkyl bromide reacting with Mg/ether. This converts the reactant in a grignard reagent, which is often used in several ketones/ladehydes reactions, and even some acid and esthers.

Now, in the second step, we see this grignard reagent, reacting with CO₂ and H₃O⁺. At first, the grignard reagent will attach to the oxygen of the CO₂ by the MgBr, and the carbonated chain will attach to the carbonile. Then in acid medium, the OMGBr leaves the molecule, and form a carboxylic acid.

Finally, in the last step with LiAlH₄ and water, this compound just reduces the carboxylic acid to a primary alcohol, therefore, the only choice available is option c, 2,2-dimethyl-1-propanol.

See picture 2 below for the drawing.

Hope this helps

8 0

3 years ago

The concept of determining which reactant is limiting and which is in excess is akin to determining the number of sandwiches tha

OLga [1]

Answer:

Cheese will be limiting reactant.

Explanation:

In given question it is stated that two slices of breads are required for one sandwich. The total bread slices available are 52. we divide the 52 by 2 to determine the number of sandwich which could made from 52 slices.

52/2 = 26

26 sandwich could be made from 52 bread slices.

The amount of cheese required for one sandwich is 3 slices. The available slices of cheese are 69.

69/3 = 23

we can see that only 23 set of slices of cheese are available while bread slices are available for 26 sandwiches. so we can make only 23 sandwiches from given quantity of ingredients. The 6 slices or 3 set of bread will left, because cheese is limited.

4 0

3 years ago

Which of the following is the correct representation of Gibbs’ Free Energy equation?

777dan777 [17]

The correct answer is: [A]: " ∆G=∆H-T∆S ".
______________________________________________

5 0

3 years ago

An ___________ is the __________________ _________________ into which an element can be divided and still be the same substance.

meriva

Answer : An atom is the smallest particle into which an element can be divided and still be the same substance.

Explanation :

Atom : It is the smallest unit of an element. Every atom is composed of a nucleus.

There are three sub-atomic particles present in every atom which are electrons, protons and neutrons.

The nucleus of an atom consist of protons and neutrons.

The electrons are revolve around the nucleus and are bound to the nucleus.

8 0

3 years ago