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malfutka [58]
3 years ago
13

Determine ΔH for Reaction 4 from these data: Reaction 4: N2H4 (l) + 2H2O2 (l) → N2 (g) + 4H2O (l) ΔH 4 = ? Reaction 1: N2H4 (l)

+ O2 (g) → N2 (g) + 2H2O (l) ΔH 1 = -622.3 kJ Reaction 2: H2 (g) + 1/2O2 (g) → H2O (l) ΔH 2 = -285.8 kJ Reaction 3: H2 (g) + O2 (g) → H2O2 (l) ΔH 3 = -187.8kJ
Chemistry
1 answer:
kaheart [24]3 years ago
5 0

Answer:

2 Answers

Anonymous

7 years ago

Best Answer

Q = m*c*ΔT

Applying the first law of thermodynamics or the law of conservation of energy i.e  

Energy lost by the metal == Energy gained by the water  so now:

m1 * c1 *( Tinitial - Tfinal ) ==  m2 * c2 *( Tfinal- Tinitial )  

(2.4)*(c1)*(98.88-20.60) == (28)*(4.2)*(20.60 - 19.73)

c1 = the specific heat of the unknown metal

c2 =the specific heat of water 4.2J/g K

Solve for c1

c1* 187.872 == 102.312

c1 == 0.5446 J/g ▫C

Note this:  

1. Changing the temperature scale from Celsius to Kelvin is quite irrelevant here, as we are working with the difference only.

2. The interchanging of ( Tinitial - Tfinal) to *( Tfinal- Tinitial ), because of the substance is losing energy, yet while the other is gaining.

Explanation:

hope i helped : )

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7 0
3 years ago
Why would an atom emit particles or waves from its nucleus?
Neko [114]

Answer:

It’s A non of these

Explanation:

5 0
3 years ago
Which of the following is true about the Lewis structure of NF3? Really need help
Ganezh [65]

Answer:

All of the above.

Explanation:

Hello there!

In this case, according to the definition of the Lewis structures, which are represented by the valence electrons, we first identify that the N atom has five valence electrons and each fluorine has seven valence electrons.

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7 0
3 years ago
Name the following compound:
lawyer [7]

Answer:

thjvfghjjvvjj

Explanation:

Assume that the set of conditionals is true. Use the Law of Syllogism to

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6 0
1 year ago
What is the mass grams that are in 2.57 × 10²⁵ molecules of I₂
lina2011 [118]

The mass of I₂ that contains 2.57×10²⁵ molecules is 10843.52 g

From a detailed understanding of Avogadro's hypothesis, we understood 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of I₂ also 6.02×10²³ molecules i.e

<h3>6.02×10²³ molecules = 1 mole of I₂</h3>

Recall:

1 mole of I₂ = 2 × 127 = 254 g

Thus,

<h3>6.02×10²³ molecules = 254 g of I₂</h3>

With the above information, we can obtain the mass of I₂ that contains 2.57×10²⁵ molecules. This is illustrated below:

6.02×10²³ molecules = 254 g of I₂

Therefore,

2.57×10²⁵ molecules = \frac{2.57*10^{25}  * 254}{6.02*10^{23}}\\\\

<h3>2.57×10²⁵ molecules = 10843.52 g of I₂</h3>

Thus, the mass of I₂ that contains 2.57×10²⁵ molecules is 10843.52 g

Learn more: brainly.com/question/24848191

5 0
2 years ago
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