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kkurt [141]
3 years ago
5

Type the correct answer in the box. Express the answer to two significant figures.

Chemistry
2 answers:
meriva3 years ago
8 0

Delta enthalpy = 2x386-3x1x432-3x942=-3350kJ/mol

Juli2301 [7.4K]3 years ago
5 0

Answer:

The enthalpy change for the reaction is -78 kJ

Explanation:

In the given reaction, 1 mol of N\equiv N and 3 moles of H-H bonds are broken. Also 6 moles of N-H bonds are formed as 1 mol of NH_{3} contains 3 moles of N-H bonds.

Now, energy is released during bond formation. So, for this case, sign of bond energy will be negative. Also energy if supplied during bond breaking. So, for this case, sign of bond energy will be positive.

Hence change in enthalpy of reaction= (1\times bond enrgy of N\equiv N)+(3\times bond energy of H-H)-(6\times bond energy of N-H)=(1\times 942)+(3\times 432)-(6\times 386)kJ= -78 kJ

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PLEASE HELP ME
BabaBlast [244]

Answer:47.05% is the percent yield of nitrogen in the reaction.

Explanation:

heoretical yield of nitrogen gas = x

Moles of ammonia =  

According to reaction,2 moles of ammonia gives 1 mol of nitrogen gas.

Then 2.3529 mol of ammonia will give:

of nitrogen gas

Mass of 1.1764 moles of nitrogen gas,x = 1.1764 mol × 28 g/mol=32.94 g

Experiential yield of nitrogen gas = 15.5 g

Percentage yield:

hope that help

47.05% is the percent yield of nitrogen in the reaction.

3 0
3 years ago
Which period is the shortest in the long form of the periodic table? Name all the
Andreyy89

Answer:

The first period is the shortest in the long form of periodic table

Explanation:

the long form or the modern periodic table is based on ht modern periodic law. it has 7 periods and 18 groups. this periodic table is widely used by people all over the world. the chemical and physical properties of the elements can be easily identified due to their classification into groups and periods or their position in the periodic table. the first period is the shortest in the long form of periodic table. there are two elements present, they are- hydrogen(H) and helium (He)

8 0
3 years ago
Which of the following statements about the ordinary IR spectroscopic regions are TRUE? 1. In general, the IR FUNDAMENTAL region
yaroslaw [1]

Answer: the statements in 1 and 2 are true of IR spectroscopic region.

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UV has energy value of 4eV - 300eV

IR has low photon energy and cannot alter atoms and molecules while UV has sufficient energy to iodize atoms therefore UV has a higher energy band.

Infrared light falls just outside the visible spectrum, beyond the edge of what we can see as red.

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The gas flows from higher concentration/pressure to lower concentration/pressure, which is outside the ball.
7 0
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tensa zangetsu [6.8K]

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